riverside bayview homes argued october decided december clean water act prohibits discharge dredged fill materials navigable waters defined waters unless authorized permit issued army corps engineers corps construing act cover freshwater wetlands adjacent covered waters corps issued regulation defining wetlands areas inundated saturated surface ground water frequency duration sufficient support normal circumstances support prevalence vegetation typically adapted life saturated soil conditions respondent riverside bayview homes hereafter respondent began placing fill materials property near shores lake clair michigan corps filed suit federal district enjoin respondent filling property without corps permission finding respondent property characterized presence vegetation requiring saturated soil conditions growth source soil conditions ground water wetland property adjacent body navigable water district held property wetland subject corps permit authority appeals reversed construing corps regulation exclude category adjacent wetlands hence waters wetlands subject flooding adjacent navigable waters frequency sufficient support growth aquatic vegetation took view corps authority act implementing regulations must narrowly construed avoid taking without compensation violation fifth amendment construction held respondent property within corps jurisdiction semiaquatic characteristics result frequent flooding nearby navigable waters therefore respondent free fill property without obtaining permit held appeals erred concluding narrow reading corps regulatory jurisdiction wetlands necessary avoid taking problem neither imposition permit requirement denial permit necessarily constitutes taking tucker act available provide compensation takings may result corps exercise jurisdiction wetlands pp district findings clearly erroneous plainly bring respondent property within category wetlands thus waters defined regulation question pp language policies history clean water act compel finding corps acted reasonably interpreting act require permits discharge material wetlands adjacent waters pp white delivered opinion unanimous kathryn oberly argued cause briefs former solicitor general lee acting solicitor general fried assistant attorney general habicht deputy solicitor general claiborne anne almy edgar washburn argued cause respondents brief richard gienapp briefs amici curiae urging reversal filed national wildlife federation et al jerry jackson frank kelley attorney general michigan louis caruso solicitor general state california et al john van de kamp attorney general california gregory taylor theodora berger assistant attorneys general steven kaufmann david hamilton deputy attorneys general joseph lieberman attorney general connecticut michael lilly attorney general hawaii neil hartigan attorney general illinois jill solicitor general william guste attorney general louisiana stephen sachs attorney general maryland hubert humphrey iii attorney general minnesota william webster attorney general missouri mike greely attorney general montana robert spire attorney general nebraska paul bardacke attorney general new mexico lacy thornburg attorney general north carolina arlene violet attorney general rhode island michael cody attorney general tennessee jeffrey amestoy attorney general vermont charlie brown attorney general west virginia bronson la follette attorney general wisconsin briefs amici curiae urging affirmance filed american petroleum institute stark ritchie james jackson citizens chincoteague reasonable wetlands policy richard nageotte developers association kenneth mcpherson pacific legal foundation et al ronald zumbrun sam kazman sarah compton robin conrad filed brief chamber commerce amicus curiae justice white delivered opinion case presents question whether clean water act cwa et together certain regulations promulgated authority army corps engineers authorizes corps require landowners obtain permits corps discharging fill material wetlands adjacent navigable bodies water tributaries relevant provisions clean water act originated federal water pollution control act amendments stat remained essentially unchanged since time act discharge dredged fill materials navigable waters defined waters forbidden unless authorized permit issued corps engineers pursuant initially construing act cover waters navigable fact corps issued interim final regulations redefining waters include actually navigable waters also tributaries waters interstate waters tributaries nonnavigable intrastate waters whose use misuse affect interstate commerce fed reg importantly present purposes corps construed act cover freshwater wetlands adjacent covered waters freshwater wetland defined area periodically inundated normally characterized prevalence vegetation requires saturated soil conditions growth reproduction cfr corps refined definition wetlands eliminating reference periodic inundation making minor changes definition reads follows term wetlands means areas inundated saturated surface ground water frequency duration sufficient support normal circumstances support prevalence vegetation typically adapted life saturated soil conditions wetlands generally include swamps marshes bogs similar areas cfr respondent riverside bayview homes hereafter respondent owns acres marshy land near shores lake clair macomb county michigan respondent began place fill materials property part preparations construction housing development corps engineers believing property adjacent wetland regulation defining waters filed suit district eastern district michigan seeking enjoin respondent filling property without permission corps district held portion respondent property lying feet sea level covered wetland enjoined respondent filling without permit civ app pet cert civ june app pet cert respondent appealed appeals remanded consideration effect intervening amendments regulation remand district held property wetland subject corps permit authority civ may app pet cert respondent appealed sixth circuit reversed construed corps regulation exclude category adjacent wetlands hence waters wetlands subject flooding adjacent navigable waters frequency sufficient support growth aquatic vegetation adopted construction regulation view broader definition wetlands might result taking private property without compensation also expressed doubt congress granting corps jurisdiction regulate filling navigable waters intended allow regulation wetlands result flooding navigable waters reading regulation respondent property within corps jurisdiction semiaquatic characteristics result frequent flooding nearby navigable waters respondent therefore free fill property without obtaining permit granted certiorari consider proper interpretation corps regulation defining waters scope corps jurisdiction clean water act called question sixth circuit ruling reverse ii question whether corps engineers may demand respondent obtain permit placing fill material property primarily one regulatory statutory interpretation must determine whether respondent property adjacent wetland within meaning applicable regulation whether corps jurisdiction navigable waters gives statutory authority regulate discharges fill material wetland connection first consider appeals position corps regulatory authority statute implementing regulations must narrowly construed avoid taking without compensation violation fifth amendment frequently suggested governmental regulation may extreme circumstances amount taking affected property see williamson county regional planning hamilton bank penn central transportation new york city never precisely defined circumstances see general approach summed agins tiburon stated application landuse regulations particular piece property taking ordinance substantially advance legitimate state interests denies owner economically viable use land moreover made quite clear mere assertion regulatory jurisdiction governmental body constitute regulatory taking see hodel virginia surface mining reclamation reasons obvious requirement person obtain permit engaging certain use property take property sense existence permit system implies permission may granted leaving landowner free use property desired moreover even permit denied may viable uses available owner permit denied effect denial prevent economically viable use land question said taking occurred neither imposition permit requirement denial permit necessarily constitutes taking follows appeals erred concluding narrow reading corps regulatory jurisdiction wetlands necessary avoid serious taking problem held general quitable relief available enjoin alleged taking private property public use duly authorized law suit compensation brought sovereign subsequent taking ruckelshaus monsanto omitted maxim rests principle long compensation available whose property fact taken governmental action unconstitutional williamson county supra precisely reason possibility application regulatory program may instances result taking individual pieces property justification use narrowing constructions curtail program compensation event available cases taking occurred circumstances adoption narrowing construction constitute avoidance constitutional difficulty cf ashwander tva brandeis concurring merely frustrates permissible applications statute regulation tucker act presumptively supplies means obtaining compensation taking may occur operation federal statute see ruckelshaus monsanto supra available provide compensation takings may result corps exercise jurisdiction wetlands appeals fears application corps permit program might result taking justify adopting limited view corps authority terms relevant regulation might otherwise support iii purged spurious constitutional overtones question whether regulation issue requires respondent obtain permit filling property easy one regulation extends corps authority wetlands adjacent navigable interstate waters tributaries wetlands turn defined lands inundated saturated surface ground water frequency duration sufficient support normal circumstances support prevalence vegetation typically adapted life saturated soil conditions cfr emphasis added plain language regulation refutes appeals conclusion inundation frequent flooding adjacent body water sine qua non wetland regulation indeed regulation hardly state clearly saturation either surface ground water sufficient bring area within category wetlands provided saturation sufficient support wetland vegetation history regulation underscores absence requirement inundation interim final regulation current regulation replaced explicitly included requirement periodi inundation cfr deleting reference periodic inundation regulation finally promulgated corps explained repudiating interpretation language requiring inundation record period years fed reg fashioning requirement frequent flooding appeals improperly reintroduced regulation precisely corps excised without nonexistent requirement frequent flooding regulatory definition adjacent wetlands covers property district found respondent property characterized presence vegetation requires saturated soil conditions growth reproduction app pet cert source saturated soil conditions property ground water plausible suggestion findings clearly erroneous plainly bring property within category wetlands defined current regulation addition found wetland located respondent property adjacent body navigable water since area characterized saturated soil conditions wetland vegetation extended beyond boundary respondent property black creek navigable waterway finding clearly erroneous together findings establish respondent property wetland adjacent navigable waterway hence part waters defined cfr regulation valid construction term waters used clean water act question address property falls within scope corps jurisdiction navigable waters act iv agency construction statute charged enforcing entitled deference reasonable conflict expressed intent congress chemical manufacturers assn natural resources defense council chevron natural resources defense council accordingly review limited question whether reasonable light language policies legislative history act corps exercise jurisdiction wetlands adjacent regularly flooded rivers streams hydrographic features conventionally identifiable waters purely linguistic level may appear unreasonable classify lands wet otherwise waters simplistic response however justice neither problem faced corps defining scope authority realities problem water pollution clean water act intended combat determining limits power regulate discharges act corps must necessarily choose point water ends land begins common experience tells us often easy task transition water solid ground necessarily even typically abrupt one rather open waters dry land may lie shallows marshes mudflats swamps bogs short huge array areas wholly aquatic nevertheless fall far short dry land continuum find limit waters far obvious faced problem defining bounds regulatory authority agency may appropriately look legislative history underlying policies statutory grants authority neither sources provides unambiguous guidance corps case together support reasonableness corps approach defining adjacent wetlands waters within meaning section originated part federal water pollution control act amendments constituted comprehensive legislative attempt restore maintain chemical physical biological integrity nation waters cwa objective incorporated broad systemic view goal maintaining improving water quality house report legislation put word integrity refers condition natural structure function ecosystems maintained protection aquatic ecosystems congress recognized demanded broad federal authority control pollution ater moves hydrologic cycles essential discharge pollutants controlled source keeping views congress chose define waters covered act broadly although act prohibits discharges navigable waters see cwa act definition navigable waters waters makes clear term navigable used act limited import adopting definition navigable waters congress evidently intended repudiate limits placed federal regulation earlier water pollution control statutes exercise powers commerce clause regulate least waters deemed navigable classical understanding term see conf cong rec statement dingell course one thing recognize congress intended allow regulation waters might satisfy traditional tests navigability another assert congress intended abandon traditional notions waters include term wetlands well nonetheless evident breadth congressional concern protection water quality aquatic ecosystems suggests reasonable corps interpret term waters encompass wetlands adjacent waters conventionally defined following lead environmental protection agency see fed reg corps determined wetlands adjacent navigable waters general matter play key role protecting enhancing water quality regulation activities cause water pollution rely artificial lines must focus waters together form entire aquatic system water moves hydrologic cycles pollution part aquatic system regardless whether ordinary high water mark mean high tide line affect water quality waters within aquatic system reason landward limit federal jurisdiction section must include adjacent wetlands form border reasonable proximity waters wetlands part aquatic system fed reg holds true even wetlands result flooding permeation water source adjacent bodies open water corps concluded wetlands may affect water quality adjacent lakes rivers streams even waters bodies actually inundate wetlands example wetlands flooded adjacent waters may still tend drain waters circumstances corps concluded wetlands may serve filter purify water draining adjacent bodies water see cfr vii slow flow surface runoff lakes rivers streams thus prevent flooding erosion see iv addition adjacent wetlands may serve significant natural biological functions including food chain production general habitat nesting spawning rearing resting sites aquatic species short corps concluded wetlands adjacent lakes rivers streams bodies water may function integral parts aquatic environment even moisture creating wetlands find source adjacent bodies water say corps judgment matters unreasonable therefore conclude definition waters encompassing wetlands adjacent bodies water corps jurisdiction permissible interpretation act respondent property part wetland actually abuts navigable waterway respondent required permit case following promulgation corps interim final regulations corps assertion authority waters actually navigable engendered congressional opposition controversy came head congress consideration clean water act major piece legislation aimed achieving interim improvements within existing framework clean water act pp end however shall explain congress acquiesced administrative construction critics corps permit program attempted insert limitations corps jurisdiction legislation house bill reported committee proposed redefinition navigable waters limited corps authority waters navigable fact adjacent wetlands defined wetlands periodically inundated contiguous navigable waters bill reported senate committee environment public works contrast contained redefinition scope navigable waters covered dealt perceived problem overregulation corps exempting certain activities primarily agricultural permit requirement providing assumption corps regulatory duties federally approved state programs floor senate however amendment proposed limiting scope navigable waters along lines set forth house bill cong rec chambers debate proposals narrow definition navigable waters centered largely issue wetlands preservation see house debate senate debate proponents limited jurisdiction contended corps assertion jurisdiction wetlands nonnavigable waters far exceeded congress intended enacting opponents proposed changes argued narrower definition navigable waters purposes exclude vast stretches crucial wetlands corps jurisdiction detrimental effects wetlands ecosystems water quality aquatic environment generally debate particularly senate lengthy house debate ended adoption narrowed definition waters senate limiting amendment defeated old definition retained conference committee adopted senate approach efforts narrow definition waters abandoned legislation ultimately passed words senator baker retain ed comprehensive jurisdiction nation waters exercised federal water pollution control act significance congress treatment corps jurisdiction consideration clean water act twofold first scope corps asserted jurisdiction wetlands specifically brought congress attention congress rejected measures designed curb corps jurisdiction large part concern protection wetlands unduly hampered narrowed definition navigable waters although chary attributing significance congress failure act refusal congress overrule agency construction legislation least evidence reasonableness construction particularly administrative construction brought congress attention legislation specifically designed supplant see bob jones university rutherford second notable even restricted reach corps jurisdiction done removing wetlands altogether definition waters restricting scope navigable waters waters navigable fact adjacent wetlands amending definition navigable waters purposes backers house bill left intact existing definition navigable waters purposes act generally prohibits discharges pollutants navigable waters house report explained navigable waters used section includes waters including adjacent wetlands thus even thought corps existing authority broad recognized definition navigable waters force reasonably interpreted include adjacent wetlands water quality concerns clean water act demanded regulation least discharges wetlands whatever jurisdiction corps retain discharges fill material passage legislation extend discharges wetlands adjacent waters corps retained jurisdiction views provide additional support conclusion congress acquiesced corps definition waters including adjacent wetlands two features actually included legislation congress enacted also support view act authorizes corps regulate discharges wetlands first amending allow federally approved state permit programs supplant regulation corps certain discharges fill material congress provided permitted supersede corps jurisdiction regulate discharges actually navigable waters waters subject ebb flow tide including wetlands adjacent thereto cwa congress expressly stated term waters included adjacent wetlands second act authorized appropriation million completion department interior national wetlands inventory assist development operation programs act cwa enactment provision reflects congressional recognition wetlands concern clean water act supports conclusion defining waters covered act include wetlands corps implementing congressional policy rather embarking frolic red lion broadcasting fcc thus persuaded language policies history clean water act compel finding corps acted reasonably interpreting act require permits discharge fill material wetlands adjacent waters regulation corps embodied interpretation terms includes wetlands respondent property within class waters may filled without permit seen reason interpret regulation narrowly terms indicate accordingly judgment appeals reversed footnotes regulations also cover certain wetlands necessarily adjacent waters see cfr provisions us denying government petition rehearing panel reiterated somewhat strongly belief corps construction regulation overbroad inconsistent language act even appeals correct concluding narrowing construction regulation necessary avoid takings property application permit requirement construction adopted requires showing frequent flooding property may classified wetland hardly tailored supposed difficulty whether denial permit constitute taking given case depend upon effect denial owner ability put property productive use whether property frequently flooded particular bearing question overbroad regulation even completely submerged property may constitute taking see kaiser aetna indeed may likely denying permit fill frequently flooded property prevent economically viable use property denying permit fill property wet flooded course excluding large chunk nation wetlands regulatory definition appeals construction might tend limit gross number takings permit program otherwise entail construction adopted still bears insufficiently precise relationship problem seeks avoid security industrial bank adopted narrowing construction statute avoid taking difficulty contrary case problem substantial argument retroactive application particular provision bankruptcy code every case constitute taking solution avoid difficulty construing statute apply prospectively approach sensible appears identifiable class cases application statute necessarily constitute taking observed case identifiable set instances mere application permit requirement necessarily even probably constitute taking approach adopting limiting construction thus unwarranted corps denied respondent permit fill property respondent may well ripe claim taking occurred record us however basis evaluating claim evidence introduced bears question extent denial permit fill property prevent economically viable uses property frustrate reasonable expectations event lawsuit proper forum resolving dispute corps indeed effectively taken respondent property respondent proper course resist corps suit enforcement denying regulation covers property initiate suit compensation claims stating course rule respondent entitled compensation temporary denial use property corps ultimately relent allow filled yet resolved question whether compensation constitutionally mandated remedy temporary regulatory takings see williamson county planning hamilton bank case provides occasion deciding issue appeals seems also rested requirement language regulation stating wetlands encompass areas normal circumstances support aquatic semiaquatic vegetation preamble final regulation corps explained language intended part exclude areas characterized abnormal presence aquatic vegetation nonaquatic area fed reg apparently appeals concluded growth wetlands vegetation soils saturated ground water rather flooded waters emanating adjacent navigable water tributaries abnormal within meaning preamble interpretation untenable light explicit statements regulation preamble areas saturated ground water fall within category wetlands nonsensical corps define wetlands include areas sentence exclude ground presence wetland vegetation areas abnormal evidently corps something else mind referred abnormal growth wetlands vegetation namely aberrational presence vegetation dry upland areas called upon address question authority corps regulate discharges fill material wetlands adjacent bodies open water see cfr express opinion question course may well every adjacent wetland great importance environment adjoining bodies water existence cases seriously undermine corps decision define adjacent wetlands waters reasonable corps conclude majority cases adjacent wetlands significant effects water quality aquatic ecosystem definition stand definition may include wetlands significantly intertwined ecosystem adjacent waterways little moment appears wetland covered corps definition fact lacking importance aquatic environment importance outweighed values corps may always allow development wetland uses simply issuing permit see cfr cong rec see also statement wallop statement randolph statement murphy statement ambro sure conclusively determine construction placed use term waters elsewhere act particularly contains relevant definition navigable waters however light fact various provisions act read pari materia least suggest strongly term waters used act necessarily exclude wetlands