citizens preserve overton park volpe argued january decided march department transportation act highway act secretary transportation may authorize use federal funds finance construction highways public parks feasible prudent alternative route exists route available may approve construction possible planning minimize harm park petitioners contend secretary violated statutes authorizing interstate highway memphis public park april secretary announced agreed local officials highway go park september state acquired inside park november secretary announced final approval including design road neither announcement secretary accompanied factual findings respondents introduced affidavits district indicating secretary made decision supportable petitioners filed counter affidavits sought take deposition former federal highway administrator district appeals found formal findings required refused order deposition former administrator courts held affidavits afforded basis determining secretary exceeded authority held secretary action subject judicial review pursuant administrative procedure act pp indication congress sought limit prohibit judicial review exemption action committed agency discretion apply secretary law apply rather discretion pp although act de novo review required secretary approval route need meet test reviewing must conduct substantial inquiry determine whether secretary acted within scope authority whether decision within small range available choices whether reasonably believed feasible alternatives must find actual choice arbitrary capricious abuse discretion otherwise accordance law secretary followed necessary procedural requirements pp formal findings secretary required case pp relevant statutes require formal findings ambiguity secretary action although regulation requiring formal findings issued secretary approved route remand necessary administrative record facilitating full prompt review secretary action pp case remanded district plenary review secretary decision pp lower review based litigation affidavits whole record inadequate basis review view lack formal findings may require administrative officials participated decision give testimony explaining action require secretary make formal findings marshall wrote opinion burger harlan stewart white blackmun joined black filed separate opinion brennan joined post blackmun filed separate statement post douglas took part consideration decision case john vardaman argued cause petitioners briefs edward bennett williams solicitor general griswold argued cause respondent volpe brief assistant attorney general gray alan rosenthal daniel joseph alan hanover argued cause respondent speight brief david pack attorney general tennessee lurton goodpasture assistant attorney general james jalenak briefs amici curiae filed james manire jack petree city memphis et roberts owen gerald norton committee federal city et al opinion justice marshall announced justice stewart growing public concern quality natural environment prompted congress recent years enact legislation designed curb accelerating destruction country natural beauty concerned case department transportation act amended highway act stat supp hereafter statutes prohibit secretary transportation authorizing use federal funds finance construction highways public parks feasible prudent alternative route exists route available statutes allow approve construction parks possible planning minimize harm park petitioners private citizens well local national conservation organizations contend secretary violated statutes authorizing expenditure federal funds construction interstate highway public park memphis tennessee claim rejected district granted secretary motion summary judgment appeals sixth circuit affirmed oral argument granted stay halted construction treating application stay petition certiorari granted review reverse judgment remand proceedings district overton park city park located near center memphis park contains zoo municipal golf course outdoor theater nature trails bridle path art academy picnic areas acres forest proposed highway expressway sever zoo rest park although roadway depressed ground level except crosses small creek acres park destroyed highway segment interstate highway part national system interstate defense highways provide memphis major expressway allow easier access downtown memphis residential areas eastern edge city although route park approved bureau public roads federal highway administrator enactment department transportation act prevented distribution federal funds section highway designated go overton park secretary transportation determined whether requirements met federal funding rest project however available state acquired sides park april secretary announced concurred judgment local officials built park september state acquired inside overton park city final approval project route well design announced november congress reiterated highway act highway construction public parks restricted neither announcement approving route design accompanied statement secretary factual findings indicate believed feasible prudent alternative routes design changes made reduce harm park petitioners contend secretary action invalid without formal findings secretary make independent determination merely relied judgment memphis city council also contend feasible prudent route around overton park either north south argue alternative routes feasible prudent present plan include possible methods reducing harm park petitioners claim built park using either two possible tunneling methods claim minimum using advanced drainage techniques expressway depressed ground level along entire route park including section crosses small creek respondents argue unnecessary secretary make formal findings fact exercise independent judgment supported facts district respondents introduced affidavits prepared specifically litigation indicated secretary made decision decision supportable affidavits contradicted affidavits introduced petitioners also sought take deposition former federal highway administrator participated decision route overton park district appeals found formal findings secretary necessary refused order deposition former federal highway administrator courts believed probing mental processes administrative decisionmaker prohibited believing secretary authority wide reviewing courts authority narrow approval highway routes lower courts held affidavits contained basis determination secretary exceeded authority agree formal findings required believe case judicial review based solely litigation affidavits adequate threshold question whether petitioners entitled judicial review easily answered section administrative procedure act supp provides action authority government includes department transportation subject judicial review except statutory prohibition review agency action committed agency discretion law case indication congress sought prohibit judicial review certainly showing clear convincing evidence legislative intent restrict access judicial review abbott laboratories gardner brownell shung similarly secretary decision fall within exception action committed agency discretion narrow exception berger administrative arbitrariness judicial review rev legislative history administrative procedure act indicates applicable rare instances statutes drawn broad terms given case law apply section department transportation act highway act clear specific directives department transportation act highway act provide secretary shall approve program project requires use public parkland unless feasible prudent alternative use land program includes possible planning minimize harm park supp supp language plain explicit bar use federal funds construction highways parks unusual situations exempted despite clarity statutory language respondents argue secretary wide discretion recognize requirement feasible alternative route admits little administrative discretion exemption apply secretary must find matter sound engineering feasible build highway along route respondents argue however requirement prudent route requires secretary engage balancing competing interests contend secretary weigh detriment resulting destruction parkland cost routes safety considerations factors determine basis importance attaches factors whether balance alternative feasible routes prudent endeavor intended obvious cases considerations cost directness route community disruption indicate parkland used highway construction whenever possible although may necessary transfer funds one jurisdiction another always smaller outlay required public purse parkland used since public already owns land need pay since people live work parks highway built parkland one leave home give business factors common substantially highway construction thus congress intended factors equal footing preservation parkland need statutes congress clearly intend cost disruption community ignored secretary existence statutes indicates protection parkland given paramount importance green havens public parks lost unless truly unusual factors present particular case cost community disruption resulting alternative routes reached extraordinary magnitudes statutes meaning secretary approve destruction parkland unless finds alternative routes present unique problems plainly law apply thus exemption action committed agency discretion inapplicable existence judicial review start standard review must also determined must look administrative procedure act supp provides reviewing shall hold unlawful set aside agency action findings conclusions found meet six separate standards cases agency action must set aside action arbitrary capricious abuse discretion otherwise accordance law action failed meet statutory procedural constitutional requirements supp certain narrow specifically limited situations agency action set aside action supported substantial evidence equally narrow circumstances reviewing engage de novo review action set aside unwarranted facts supp petitioners argue secretary approval construction overton park subject one latter two standards limited applicability first contend substantial evidence standard must applied alternative claim applies must de novo review determine secretary action unwarranted facts neither standards however applicable review test authorized agency action taken pursuant rulemaking provision administrative procedure act supp agency action based public adjudicatory hearing see supp secretary decision allow expenditure federal funds build overton park plainly exercise rulemaking function see davis administrative law treatise hearing required either administrative procedure act statutes regulating distribution federal funds highway construction public hearing conducted local officials purpose informing community proposed project eliciting community views design route supp hearing nonadjudicatory nature designed produce record basis agency action basic requirement review see sess petitioners alternative argument also fails de novo review whether secretary decision unwarranted facts authorized two circumstances first de novo review authorized action adjudicatory nature agency factfinding procedures inadequate may independent judicial factfinding issues agency raised proceeding enforce nonadjudicatory agency action sess neither situation exists even though de novo review case secretary approval route ultimately meet test generally applicable standards require reviewing engage substantial inquiry certainly secretary decision entitled presumption regularity see pacific box basket white chemical foundation presumption shield action thorough probing review first required decide whether secretary acted within scope authority schilling rogers determination naturally begins delineation scope secretary authority discretion jaffe judicial control administrative action shown congress specified small range choices secretary make also involved initial inquiry determination whether facts secretary decision reasonably said within range reviewing must consider whether secretary properly construed authority approve use parkland limited situations feasible alternative routes feasible alternative routes involve uniquely difficult problems reviewing must able find secretary reasonably believed case feasible alternatives alternatives involve unique problems scrutiny facts end however determination secretary acted within scope statutory authority section requires finding actual choice made arbitrary capricious abuse discretion otherwise accordance law supp make finding must consider whether decision based consideration relevant factors whether clear error judgment jaffe supra see mcbee bomar josephson western addition community organization weaver supp nd cal see also wong wing hang immigration naturalization although inquiry facts searching careful ultimate standard review narrow one empowered substitute judgment agency final inquiry whether secretary action followed necessary procedural requirements procedural error alleged failure secretary make formal findings state reason allowing highway built park undoubtedly review secretary action hampered failure make findings absence formal findings necessarily require case remanded secretary neither department transportation act highway act requires formal findings moreover administrative procedure act requirements formal findings certain rulemaking adjudicatory proceedings apply secretary action see supp although formal findings may required cases absence statutory directives nature agency action ambiguous situations rare see city yonkers american trucking assns plainly ambiguity secretary approved construction overton park approved specific design project petitioners contend although may statutory requirement secretary make formal findings even though may case reviewing impose requirement findings made department transportation regulations require argument based dot order requires secretary make formal findings approves use parkland highway construction issued route approved petitioners argue even though order effect time approval given overton park project even though order intended retrospective effect order represents law time decision thorpe housing authority applied case thorpe litigation resulted attempt evict tenant federally funded housing project circumstances suggested eviction prompted tenant objections management project despite repeated requests housing authority give explanation action tenant claimed eviction interfered exercise first amendment rights failure state reasons eviction afford hearing denied due process denial relief state courts granted certiorari consider whether tenant denied due process housing authority refusal state reasons eviction afford hearing contest sufficiency reasons case pending department housing urban development issued regulations requiring housing authority officials inform tenants reasons eviction give tenant opportunity reply case remanded state courts determine hud regulations applicable case state held applicable reversed ground general rule appellate must apply law effect time renders decision question dot order constitutes law effect time decision believe thorpe compels us remand secretary make formal findings unlike situation thorpe change circumstances additional cleared inside overton park purchased state moreover administrative record allows full prompt review secretary action sought without additional delay result remand secretary administrative record however us lower courts based review litigation affidavits presented affidavits merely post hoc rationalizations burlington truck lines traditionally found inadequate basis review burlington truck lines supra sec chenery clearly constitute whole record compiled agency basis review required administrative procedure act see supra thus necessary remand case district plenary review secretary decision review based full administrative record secretary time made decision since bare record may disclose factors considered secretary construction evidence may necessary district require explanation order determine secretary acted within scope authority secretary action justifiable applicable standard may require administrative officials participated decision give testimony explaining action course inquiry mental processes administrative decisionmakers usually avoided morgan administrative findings made time decision case morgan must strong showing bad faith improper behavior inquiry may made formal findings may way effective judicial review examining decisionmakers see shaughnessy accardi district however required make inquiry may secretary prepare formal findings including information required dot order provide adequate explanation action explanation extent post hoc rationalization thus must viewed critically district decides additional explanation necessary consider method prove expeditious full review may soon possible reversed remanded footnotes hereby declared national policy special effort made preserve natural beauty countryside public park recreation lands wildlife waterfowl refuges historic sites secretary transportation shall cooperate consult secretaries interior housing urban development agriculture developing transportation plans programs include measures maintain enhance natural beauty lands traversed august secretary shall approve program project requires use publicly owned land public park recreation area wildlife waterfowl refuge national state local significance determined federal state local officials jurisdiction thereof land historic site national state local significance determined officials unless feasible prudent alternative use land program includes possible planning minimize harm park recreational area wildlife waterfowl refuge historic site resulting use stat supp hereby declared national policy special effort made preserve natural beauty countryside public park recreation lands wildlife waterfowl refuges historic sites secretary transportation shall cooperate consult secretaries interior housing urban development agriculture developing transportation plans programs include measures maintain enhance natural beauty lands traversed effective date highway act secretary shall approve program project requires use publicly owned land public park recreation area wildlife waterfowl refuge national state local significance determined federal state local officials jurisdiction thereof land historic site national state local significance determined officials unless feasible prudent alternative use land program includes possible planning minimize harm park recreational area wildlife waterfowl refuge historic site resulting use supp supp supp ibid see case originated district district columbia application secretary transportation transferred district western district tennessee entered summary judgment ordered case heard expedited schedule proposed feet wide follow route presently existing nonaccess bus route carries occasional bus traffic along see supp also provide express bypass traffic memphis time bureau public roads part department commerce department transportation act et seq supp became effective april transferred bureau new department transportation secretary approved acquisitions shortly effective date state paid city memphis park commission replace park facilities destroyed highway city memphis used funds pay new park anticipated additional parkland acquired remaining money respondents argue issue raised petitioners pleadings failure secretary make formal findings petitioners complaint read revealing light conley gibson clear petitioners also challenged merits secretary decision petitioners contend former federal highway administrator bridwell account april meeting memphis city council given senate subcommittee roads senate committee public works supports charge see hearings urban highway planning location design subcommittee roads senate committee public works pt pp petitioners argue either bored tunnel tunnel fully depressed route covered construction built respondents contend construction tunnel either method greatly increase cost project create safety hazards increases air pollution reduce harm park petitioners contend adequate drainage provided using mechanical pumps form inverted siphon claim devices often used expressway construction petitioners wanted question former highway administrator bridwell see supra addition department transportation act makes administrative procedure act applicable proceedings department transportation supp see also rusk cort scope exception subject extensive commentary see berger administrative arbitrariness synthesis yale saferstein nonreviewability functional analysis committed agency discretion harv rev davis administrative arbitrariness always reviewable rev berger administrative arbitrariness sequel rev see cong rec statement holifield see supra see cong rec statement yarborough see legislative history indicates secretary limit consideration information supplied state local officials go beyond information reach independent decision cong rec legislative history department transportation act supp highway act supp ambiguous legislative committee reports tend support respondents view statutes merely general directives secretary requiring consider importance parkland well cost community disruption factors see statements proponents statutes well senate committee report indicate however secretary limited authority see cong rec see also conf ambiguity clear must look primarily statutes find legislative intent extent necessary decision presented reviewing shall decide relevant questions law interpret constitutional statutory provisions determine meaning applicability terms agency action reviewing shall compel agency action unlawfully withheld unreasonably delayed hold unlawful set aside agency action findings conclusions found arbitrary capricious abuse discretion otherwise accordance law contrary constitutional right power privilege immunity excess statutory jurisdiction authority limitations short statutory right without observance procedure required law unsupported substantial evidence case subject sections title otherwise reviewed record agency hearing provided statute unwarranted facts extent facts subject trial de novo reviewing making foregoing determinations shall review whole record parts cited party due account shall taken rule prejudicial error supp regulation promulgated pursuant executive order dated march fed reg instructed federal agencies initiate procedures needed direct policies programs toward meeting national environmental goals dot order issued october even formal findings secretary mandatory proper course remand case district directing order secretary make formal findings see robertson kirkham jurisdiction wolfson kurland ed course district prohibited remanding case secretary see infra solicitor general urges order avoid additional delay proper course remand case district review full administrative record separate opinion justice black justice brennan joins agree judgment appeals wrong action reversed agree whole matter remanded district think case sent back secretary transportation apparent opinion today secretary transportation completely failed comply duty imposed upon congress permit federally financed public highway run public park unless feasible prudent alternative use land program includes possible planning minimize harm park supp supp congressional command taken lightly secretary represents solemn determination highest body nation beauty facilities parks taken away public roads without hearings factfindings policy determinations supervision cabinet officer secretary transportation act congress connection federal highway aid legislation seems calls hearings hearings review hearings demonstrate mere arbitrary defiance secretary whether findings growing hearings labeled formal informal appears exercise semantics whatever hearing requirements might department transportation failed meet case regret compelled conclude except formulations apparently coming solicitor general office record contains one word indicate secretary raised even finger comply command congress duty believe remand whole matter back secretary transportation give matter hearing deserves full obedience act congress act obviously passed protect public parks forays road builders except extraordinary imperative circumstances record demonstrate existence circumstances dissent failure send case back secretary whose duty yet performed see supp regulations promulgated thereunder fed reg see also named individual members san antonio conservation society texas highway department dissents denial certiorari justice blackmun fully join opinion judgment merely wish state obvious case comes end product decade endeavor solve interstate highway problem memphis administrative decisions attack single secretary made present secretary predecessor department commerce bureau public roads act act cut across former methods imposed new standards conditions upon situation already largely developed undoubtedly record sketchy less one expect project one instituted passage act