The Colorado River has been named America's Most Endangered River seven times.

America's Most Endangered Rivers is a list of threatened rivers in the United States compiled by the nonprofit group American Rivers. First published in 1984, the annual list spotlights ten threatened rivers–rivers that are facing environmental degradation due to existing or proposed development projects. The list is intended to build public awareness and spur action toward addressing specific environmental issues.[1][2]

Lists

2023 rivers

On April 18, 2023,[3] American Rivers announced its ten most endangered rivers of 2023.[4]

RankRiverState(s)Threats
1Grand Canyon of the Colorado RiverAZClimate change, mismanagement
2Ohio RiverPA, OH, WV, KY, IN, ILPollution, climate change
3Pearl RiverMSDredging, dams
4Snake RiverID, OR, WADams
5Clark Fork RiverMTPollution
6Eel RiverCADams
7Lehigh RiverPADevelopment
8Chilkat and Klehini RiversAKMining
9Rio GallinasNMClimate change, mismanagement
10Okefenokee SwampGA, FLMining

2022 rivers

On April 19, 2022,[5] American Rivers announced its ten most endangered rivers of 2022.[6]

RankRiverState(s)Threats
1Colorado RiverCO, UT, AZ, NV, CA, WY, NMClimate change, mismanagement
2Snake RiverID, OR, WADams
3Mobile RiverALPollution
4Maine's Atlantic salmon riversMEDams
5Coosa RiverTN, GA, ALPollution
6Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AK, MS, LAPollution, habitat loss
7Lower Kern RiverCAOver-withdrawal
8San Pedro RiverAZOver-withdrawal
9Los Angeles RiverCADevelopment, pollution
10Tar CreekOKPollution

2021 rivers

On April 13, 2021,[7] American Rivers announced its ten most endangered rivers of 2021.[8]

RankRiverState(s)Threats
1Snake RiverID, OR, WADams
2Lower Missouri RiverMO, IA, NE, KSMismanagement, climate change
3Boundary WatersMNMining
4South RiverGAPollution
5Pecos RiverNMMining
6Tar CreekOKPollution
7McCloud RiverCADams
8Ipswich RiverMAOver-withdrawal
9Raccoon RiverIAPollution
10Turkey CreekMSDevelopment

2020 rivers

On April 14, 2020,[9] American Rivers announced its ten most endangered rivers of 2020.[10]

RankRiverState(s)Threats
1Upper Mississippi RiverMN, WI, IL, IAClimate change, mismanagement
2Lower Missouri RiverMO, IA, NE, KSClimate change, mismanagement
3Big Sunflower RiverMSHabitat loss
4Puyallup RiverWADams
5South Fork Salmon RiverIDMining
6Menominee RiverMI, WIMining
7Rapid CreekSDMining
8Okefenokee Swamp and St. Marys RiverGA, FLMining
9Ocklawaha RiverFLDams
10Lower Youghiogheny RiverPANatural gas

2019 rivers

On April 16, 2019,[11] American Rivers announced its ten most endangered rivers of 2019.[12]

RankRiverState(s)Threats
1Gila RiverNMOver-withdrawal
2Hudson RiverNYStorm-surge barrier
3Upper Mississippi RiverIL, IA, MOLevees
4Green-Duwamish RiverWAHabitat loss
5Willamette RiverORDams
6Chilkat RiverAKMining
7South Fork Salmon RiverIDMining
8Buffalo National RiverARPollution
9Big Darby CreekOHDevelopment
10Stikine RiverAKMining

2018 rivers

On April 11, 2018,[13] American Rivers announced its ten most endangered rivers of 2018.[14]

RankRiverState(s)Threats
1Big Sunflower RiverMSPumping project
2Rivers of Bristol BayAKMining
3Boundary WatersMNMining
4Lower Rio GrandeTXHabitat loss
5South Fork Salmon RiverIDMining
6Mississippi River GorgeMNDams
7Smith RiverMTMining
8Colville RiverAKDevelopment
9Middle Fork Vermilion RiverILPollution
10Kinnickinnic River (St. Croix River tributary)WIDams

2017 rivers

On April 11, 2017,[15] American Rivers announced its ten most endangered rivers of 2017.[16]

RankRiverState(s)Threats
1Lower Colorado RiverAZ, NV, CAClimate change, over-withdrawal
2Bear RiverCADams
3South Fork Skykomish RiverWAHydropower
4Rivers of Mobile BayAL, GA, MSMismanagement
5Rappahannock RiverVAFracking
6Green-Toutle RiverWAMining
7Neuse and Cape Fear RiversNCLivestock pollution
8Middle Fork Flathead RiverMTOil transport
9Buffalo National RiverARLivestock pollution
10Menominee RiverMI, WIMining

2016 rivers

In April 2016, American Rivers announced its ten most endangered rivers of 2016.[17]

RankRiverState(s)Threats
1Apalachicola-Chattahoochee-Flint River BasinAL, FL, GAMismanagement
2San Joaquin RiverCAMismanagement
3Susquehanna RiverPADams
4Smith RiverMTMining
5Green-Duwamish RiverWADams, pollution
6Pee Dee RiverNCDams
7Russell Fork RiverKY, WVMining
8Merrimack RiverMA, NHPollution
9St. Lawrence RiverNYDams
10Pascagoula RiverMS, ALDams

2015 rivers

On April 7, 2015,[18] American Rivers announced its ten most endangered rivers of 2015.[19]

RankRiverState(s)Threats
1Grand Canyon of the Colorado RiverAZDevelopment, mining, groundwater depletion
2Columbia RiverWA, ORDams
3Holston RiverTNPollution
4Smith RiverMTMining
5Edisto RiverSCOver-withdrawal
6Chuitna RiverAKMining
7Rogue and Smith RiversOR, CAMining
8St. Louis RiverMNMining
9Harpeth RiverTNPollution, over-withdrawal
10Pearl RiverMS, LADams

2014 rivers

On April 9, 2014,[20] American Rivers announced its ten most endangered rivers of 2014.[21]

RankRiverState(s)Threats
1San Joaquin RiverCAMismanagement
2Upper Colorado RiverCOWater diversions
3Middle Mississippi RiverMO, IL, KYMismanagement
4Gila RiverNMWater diversions
5San Francisquito CreekCADams
6South Fork Edisto RiverSCOver-withdrawal
7White River (Colorado)COPetroleum development
8White River (Washington)WADams
9Haw RiverNCPollution
10Clearwater and Lochsa RiversIDIndustrializaton

2013 rivers

In April 2013, American Rivers announced its ten most endangered rivers of 2013.[22]

RankRiverState(s)Threats
1Colorado RiverCO, UT, AZ, NV, CA, WY, NMMismanagement
2Flint RiverGAMismanagement
3San Saba RiverTXMismanagement
4Little Plover RiverWIMismanagement
5Catawba RiverNC, SCCoal ash pollution
6Boundary WatersMNMining
7Black Warrior RiverALMining
8Rough & Ready and Baldface CreeksORMining
9Kootenai RiverMT, IDMining
10Niobrara RiverNE, SD, WYSedimentation

2012 rivers

In May 2012, American Rivers announced its ten most endangered rivers of 2012.[23]

RankRiverState(s)Threats
1Potomac RiverMD, VA, PA, WV, DCPollution
2Green RiverWY, UT, COPumping project
3Chattahoochee RiverGADams
4Missouri RiverCO, IA, KS, MN, MO, MT, NE, ND, SD, WYMismanagement
5Hoback RiverWYNatural gas
6Grand RiverOHNatural gas
7South Fork Skykomish RiverWADams
8Crystal RiverCODams
9Coal RiverWVMining
10Kansas RiverKSDredging

2011 rivers

In May 2011, American Rivers announced its ten most endangered rivers of 2011.[24]

RankRiverState(s)Threats
1Susquehanna RiverNY, PA, MDNatural gas
2Rivers of Bristol BayAKMining
3Roanoke RiverVA, NCMining
4Chicago RiverILSewage pollution
5Yuba RiverCADams
6Green River (North Fork Toutle River tributary)WAMining
7Hoback RiverWYNatural gas
8Black Warrior RiverALMining
9St. Croix RiverWI, MNBridge project
10Ozark National Scenic RiverwaysMOOveruse, mismanagement

2010 rivers

On June 2, 2010, American Rivers announced its ten most endangered rivers of 2010.[25]

RankRiverState(s)Threats
1Upper Delaware RiverNY, PANatural gas
2Sacramento–San Joaquin River DeltaCAMismanagement
3Gauley RiverWVMining
4Little RiverNCDams
5Cedar RiverIAMismanagement
6Upper Colorado RiverCOWater diversions
7Chetco RiverORMining
8Teton RiverIDTeton Dam reconstruction proposal
9Monongahela RiverPA, WVNatural gas
10Coosa RiverALDams

2009 rivers

On April 7, 2009, American Rivers announced its ten most endangered rivers of 2009.[26]

RankRiverState(s)Threats
1Sacramento and San Joaquin RiversCAMismanagement
2Flint RiverGADams
3Lower Snake RiverID, OR, WADams
4Mattawoman CreekMDDevelopment
5North Fork Flathead RiverMTProposed mines
6Saluda RiverSCSewage pollution
7Laurel Hill CreekPAOver-withdrawal
8Beaver CreekAKProposed petroleum development
9Pascagoula RiverMSProposed petroleum storage project
10Lower St. Croix National Scenic RiverwayMN, WIDevelopment

2008 rivers

In May 2008, American Rivers announced its ten most endangered rivers of 2008.[27]

RankRiverState(s)Threats
1Catawba-Wateree RiverNC, SCMismanagement
2Rogue RiverORLogging, road construction
3Cache la Poudre RiverCOWater diversion, dams
4St. Lawrence RiverNYDams
5Minnesota RiverMNProposed power plant
6St. Johns RiverFLOver-withdrawal
7Gila RiverNM, AZProposed water diversion
8Allagash Wilderness WaterwayMEProposed removal of legal protection
9Pearl RiverMS, LAFloodplain development
10Niobrara RiverWY, NEIrrigation diversions

2007 rivers

In April 2007, American Rivers announced its ten most endangered rivers of 2007.[28][29]

RankRiverState(s)Threats
1Santa Fe RiverNMMismanagement
2San Mateo Creek (Southern California)CAProposed highway
3Iowa RiverIAPollution
4Upper Delaware RiverNYProposed power line
5White Salmon RiverWACondit Dam
6Neches RiverTXProposed dams
7Kinnickinnic River (Milwaukee River tributary)WIToxic sediments
8Neuse RiverNCDevelopment
9Lee RiverAR, OKProposed dam
10Chuitna RiverAKProposed coal mine

2006 rivers

In April 2006, American Rivers announced its ten most endangered rivers of 2006.[30][31]

RankRiverState(s)Threats
1Pajaro RiverCAFlood control project
2Upper Yellowstone RiverMTFloodplain development
3Willamette RiverORPollution
4Salmon Trout RiverMIProposed mine
5Shenandoah RiverVA, WVOverdevelopment
6Boise RiverIDProposed mine
7Caloosahatchee RiverFLToxic water discharge from Lake Okeechobee
8Rivers of Bristol BayAKProposed mining district
9San Jacinto RiverTXUnregulated sand mining
10Verde RiverAZProposed groundwater pumping

2005 rivers

In April 2005, American Rivers announced its ten most endangered rivers of 2005.[32][33]

RankRiverState(s)Threats
1Susquehanna RiverNY, PA, MDSewage pollution, proposed dam
2McCrystal CreekNMProposed methane drilling
3Fraser RiverCOProposed increase in water withdrawal
4Skykomish RiverWAOverdevelopment
5Roan CreekTNProposed factory dairy farm
6Santee RiverSCOver-withdrawal
7Little Miami RiverOHPollution
8Tuolumne RiverCAProposed increase in water withdrawal
9Price RiverUTProposed dam and dewatering
10Santa Clara RiverCAOverdevelopment

2004 rivers

In April 2004, American Rivers announced its ten most endangered rivers of 2004.[34][35]

RankRiverState(s)Threats
1Colorado RiverCO, UT, NV, AZ, CAPollution
2Big Sunflower RiverMSProposed drainage and dredging project
3Snake RiverWY, ID, OR, WADams
4Tennessee RiverTN, AL, MS, KYSewage pollution
5Allegheny and Monongahela RiversPA, WV, NYCoal mine pollution
6Spokane RiverID, WAOver-withdrawal, pollution
7Housatonic RiverMA, CTPolychlorinated biphenyl pollution
8Peace RiverFLPhosphate mine pollution
9Big Darby CreekOHOverdevelopment
10Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AK, MS, LADams, levees, pollution

2003 rivers

In April 2003, American Rivers announced its ten most endangered rivers of 2003.[36][37]

RankRiverState(s)Threats
1Big Sunflower RiverMSProposed drainage and dredging project
2Klamath RiverCA, ORIrrigation withdrawals, dams, pollution
3Ipswich RiverMAGroundwater pumping, over-withdrawal
4Gunnison RiverCOOver-withdrawal
5Rio GrandeCO, NM, TXDiversion and over-withdrawal
6Mattaponi RiverVAProposed dam
7Platte RiverWY, CO, NEProposed water supply development
8Snake RiverID, OR, WADams
9Tallapoosa RiverAL, GADams, overallocation
10Trinity RiverTXProposed flood control project, floodplain development

2002 rivers

On April 4, 2002, American Rivers announced its eleven most endangered rivers of 2002.[38][39]

RankRiverState(s)Threats
1Missouri RiverMT, ND, SD, MO, IA, NE, KSHabitat loss from unnatural dam operations
2Big Sunflower RiverMSProposed drainage and dredging project
3Klamath RiverCA, ORIrrigation withdrawals, dams, pollution
4Kansas RiverKSAgricultural pollution
5White RiverARIrrigation project, proposed navigation project
6Powder RiverWYCoal bed methane pollution
7Altamaha RiverGAOver-withdrawal
8Allagash Wilderness WaterwayMEProposed loss of legal protections
9Canning RiverAKProposed petroleum development
10Guadalupe RiverTXProposed over-withdrawal
11Apalachicola RiverFLDredging

2001 rivers

On April 11, 2001, American Rivers announced its thirteen most endangered rivers of 2001.[40][41][42]

RankRiverState(s)Threats
1Missouri RiverMT, ND, SD, MO, IA, NE, KSHabitat loss from unnatural dam operations
2Canning RiverAKProposed petroleum development
3Eel RiverCADams
4Hudson RiverNYPolychlorinated biphenyl pollution
5Powder RiverWYCoal bed methane pollution
6Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AK, MS, LAProposed flood control project, wetlands destruction, pollution
7Big Sandy RiverWV, KYCoal sludge spill
8Snoqualmie RiverWAOverdevelopment
9Animas RiverCO, NMProposed water project
10East Fork Lewis RiverWAProposed gravel mine expansion
11Paine RunVAAcid rain pollution
12Hackensack River and MeadowlandsNJ, NYOverdevelopment
13Catawba RiverNC, SCOverdevelopment

2000 rivers

On April 10, 2000, American Rivers announced its thirteen most endangered rivers of 2000.[43][44][45]

RankRiverState(s)Threats
1Snake RiverID, OR, WADams
2Missouri RiverMT, ND, SD, MO, IA, NE, KSFlood control works
3Ventura RiverCAMatilija Dam
4Copper RiverAKProposed logging road
5Apalachicola-Chattahoochee-Flint and Alabama-Coosa-Tallapoosa River BasinsAL, FL, GATri-state water dispute, over-withdrawal, dams, urban sprawl, pollution
6Coal RiverWVMining
7Rio GrandeCO, NM, TXPollution, dams, water demand
8Snoqualmie RiverWAOverdevelopment
9Mississippi and White RiversARDredging proposal
10Clear CreekTXProposed flood control project
11Green RiverUT, COFlaming Gorge Dam
12Presumpscot RiverMEDams impeding American shad and Atlantic salmon migration
13Clark Fork RiverMTProposed silver and copper mine

1999 rivers

RankRiver[46][47]State(s)Threats
1Lower Snake RiverID, OR, WADams
2Missouri RiverMT, ND, SD, MO, IA, NE, KSFlood control works
3Alabama-Coosa-Tallapoosa River BasinAL, GAOverdevelopment over-withdrawal, pollution
4San Pedro RiverAZOverdevelopment, groundwater pumping
5Yellowstone RiverMT, NDChannelization
6Cedar RiverWAOverdevelopment, over-withdrawal
7Fox RiverIL, WIOverdevelopment, pollution
8Carmel RiverCAOverdevelopment, over-withdrawal, dams
9Coal RiverWVMining
10Bear RiverUTOverdevelopment, over-withdrawal

1998 rivers

On April 6, 1998, American Rivers announced its twenty most endangered rivers of 1998.[48][49]

RankRiverState(s)Threats
1Hanford Reach of the Columbia RiverWAPublic land transfer, irrigation, nuclear waste
2Missouri RiverMT, ND, SD, MO, IA, NE, KSChannelization, dams
3Pocomoke RiverDE, MD, VAAgricultural pollution
4Kern RiverCADams
5Blackfoot RiverMTProposed gold mine
6Colorado River DeltaBCN, SONOver-allocation
7Chattahoochee RiverAL, GA, FLOverdevelopment, pollution
8Lower Snake RiverID, OR, WADams
9Apple RiverWI, ILFactory hog farm pollution
10Pinto CreekAZProposed copper mine
11Wolf RiverWIProposed mine
12Potomac RiverMD, VA, PA, WV, DCLivestock pollution, overdevelopment
13Rogue and Illinois Rivers, Elk and Rough & Ready CreeksORDams, proposed mine
14Taku RiverAKProposed mine
15Crooked CreekARIn-stream gravel mining
16Passaic RiverNJContaminated sediments
17Mattaponi RiverVAProposed water development project
18Walla Walla RiverOR, WAFlow depletion, agricultural pollution, channelization
19Uinta RiverUTProposed diversion dam
20Kansas RiverKSPollution

1997 rivers

On April 16, 1997, American Rivers announced its ten most endangered rivers of 1997.[50]

RankRiverState(s)Threats
1Missouri RiverIA, KS, MN, MO, MT, NE, ND, SDNavigation
2Upper Hudson RiverNYPolychlorinated biphenyl pollution
3White Salmon RiverGA, AL, FLCondit Dam
4San Joaquin RiverCAFloodplain development, agricultural pollution
5Wolf RiverWIProposed mine
6Pinto CreekAZProposed copper mine
7Potomac RiverMD, VA, PA, WV, DCLivestock pollution, development
8Mill CreekOHIndustrialization, development, channelization
9Lower Colorado RiverAZ, NV, CAOver-allocation
10Tennessee RiverTN, AL, MS, KYProposed elimination of the TVA's environmental protection programs

1996 rivers

On April 17, 1996, American Rivers announced its ten most endangered rivers of 1996.[51]

RankRiverState(s)Threats
1Clarks Fork Yellowstone RiverWY, MTProposed New World Mine
2American RiverCAProposed Auburn Dam
3Upper Chattahoochee and Etowah RiversGA, AL, FLSewage, development, sedimentation
4Missouri RiverCO, IA, KS, MN, MO, MT, NE, ND, SD, WYDams, pollution
5Upper Hudson RiverNYPollution, development, dams
6Columbia, John Day, and White Salmon RiversID, WA, ORGrazing, irrigation diversions, logging, dams
7Elk RiverORTimber sales
8Pinto CreekAZMining
9Penobscot RiverMEBasin Mills Dam
10Animas RiverCO, NMWater development project

1995 rivers

RankRiver[52]State(s)Threats
1Clarks Fork Yellowstone RiverWY, MTMine
2Los Angeles RiverCAFlood control, neglect
3Columbia and Snake RiversID, WA, ORDams, irrigation
4Animas RiverCOWater development project
5Missouri RiverCO, IA, KS, MN, MO, MT, NE, ND, SD, WYDams, channelization
6Kansas RiverKSAgricultural runoff, sand dredging
7Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AR, MS, LAFlood control, runoff
8Cheat RiverWVAcid mine drainage, proposed dam
9Penobscot RiverMEDams
10Thorne RiverAKLogging

1994 rivers

RankRiver[52]State(s)Threats
1Clarks Fork Yellowstone RiverWY, MTMine
2Anacostia RiverDC, MDUrban runoff
3Clavey RiverCADams
4Columbia and Snake RiversID, WA, ORDams, logging
5Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AR, MS, LAFlood control, runoff
6Missouri RiverCO, IA, KS, MN, MO, MT, NE, ND, SD, WYDams, channelization
7Penobscot RiverMEProposed dam
8Rio GrandeCO, NM, TXPollution, mine waste
9Thorne RiverAKLogging
10Virgin RiverUT, AZ, NVDiversions, development

1993 rivers

RankRiver[52]State(s)Threats
1Rio Grande and Rio ConchosCO, NM, TXPollution
2Columbia, Snake, and Yakima RiversID, WA, ORDams
3EvergladesFLDiversion, agricultural pollution
4Anacostia RiverDC, MDSewage, development, sedimentation, dumping
5Virgin RiverUT, AZ, NVDams
6Rogue and IllinoisORLogging
7Penobscot RiverMEProposed dam
8Clavey RiverCAHydroelectric project
9Alsek and Tatshenshini RiversAKProposed mine
10Platte RiverNEDam

1992 rivers

RankRiver[52]State(s)Threats
1Columbia and Snake RiversID, WA, ORDams
2Alsek and Tatshenshini RiversAKProposed mine
3Great Whale RiverQCHydroelectric project
4EvergladesFLFlood control project
5American RiverCAProposed dam
6Colorado RiverAZGlen Canyon Dam
7Mississippi RiverMN, WI, IL, IA, MO, KY, TN, AR, MS, LAHydroelectric, barge spills, agriculture, industrial discharge
8Penobscot RiverMEProposed dam
9Beaverkill River and Willowemoc CreekNYLogging, development
10Blackfoot RiverMTLogging, grazing, agriculture, mining

1991 rivers

RankRiver[52]State(s)Threats
1Colorado RiverAZGlen Canyon Dam
2Alsek and Tatshenshini RiversAKProposed mine
3American RiverCAProposed dam
4Penobscot RiverMEProposed dam
5Susquehanna RiverPAProposed dam
6Upper Mississippi RiverMN, WI, IL, IAOil spills, hazardous cargo transport
7Columbia and Snake RiversID, WA, ORDams
8Gunnison RiverCODam project
9Passaic RiverNJProposed flood-control tunnel
10New RiverNCDevelopment

1990 rivers

RankRiver[52]State(s)Threats
1Klamath RiverORProposed hydroelectric project
2South Platte RiverCOProposed dam
3Penobscot RiverMEProposed dam
4American RiverCAProposed dam
5Bruneau and Jarbidge RiversIDAir Force missile range
6Alsek and Tatshenshini RiversAKProposed mine
7Passaic RiverNJProposed flood-control tunnel
8Cahaba RiverALProposed methane project
9Jemez RiverNMProposed pumice mine
10James RiverMOProposed dam

1989 rivers

RankRiver[52]State(s)Threats
1Platte RiverCO, NEDams
2Klamath RiverORProposed dam
3American RiverCAProposed dam
4Penobscot RiverMEProposed dam
5Payette RiverIDProposed dams
6James RiverVAProposed hydroelectric project
7Little Bighorn RiverWYHydroelectric project
8Illinois BayouARProposed dam
9New RiverNCDevelopment
10Animas RiverCOIrrigation project

1988 rivers

RankRiver[52]State(s)Threats
1South Platte RiverCOProposed dam
2Klamath RiverORProposed dam
3Little Bighorn RiverWYProposed dam
4Greenbrier RiverWVProposed dam
5Platte RiverNEDams
6Hanford Reach of the Columbia RiverWAProposed dredging
7Susquehanna RiverPAProposed dam
8American RiverCAProposed dam
9Animas RiverCOProposed irrigation project
10Black RiverNYProposed hydroelectric projects

1987 rivers

American Rivers announced its ten most endangered rivers of 1987 via press release, with no accompanying report. All ten rivers faced dam proposals. The rivers were not ranked.[52]

RiverState(s)Threats
Kings RiverCAProposed dam
Merced RiverCAProposed dam
Merrimack RiverNHProposed dam
Illinois BayouARProposed dam
Verde RiverAZProposed dam
Klamath RiverORProposed dam
Greenbrier RiverWVProposed dam
Platte RiverCO, NE, WYProposed dam
Little Bighorn RiverWYProposed dam
Black RiverNYProposed dam

1986 rivers

American Rivers announced its ten most endangered rivers of 1986 via press release, with no accompanying report. The rivers were not ranked.[52]

RiverState(s)Threats
Kings RiverCAProposed hydroelectric project
Merced RiverCAProposed hydroelectric project
Kern RiverCAProposed dam
Maurice RiverNJProposed toxic waste incinerator site
Menantico CreekNJProposed toxic waste incinerator site
Manumuskin RiverNJProposed toxic waste incinerator site
Niobrara RiverNEProposed dam
Black RiverNYProposed hydroelectric project
Rio ChamaNMProposed raising of reservoir level
Merrimack RiverNHDam project at Sewalls Falls

Most-listed rivers

A number of rivers have been listed on America's Most Endangered Rivers multiple times, either in whole or in part. This list includes items that have appeared three or more times.

Times listedRiver
14 Snake River
12 Colorado River
Mississippi River
Missouri River
9 Columbia River
8 Penobscot River
6 American River
Klamath River
5 Animas River
Big Sunflower River
Chattahoochee River
Platte River
Rio Grande
San Joaquin River
Susquehanna River
4 Alsek River
Coosa River
Flint River
Hudson River
Kansas River
Rogue River (Oregon)
Tatshenshini River
3 Apalachicola River
Black River (New York)
Boundary Waters
Rivers of Bristol Bay
Catawba River
Clarks Fork Yellowstone River
Coal River
Pearl River
Flint River
Gila River
Kern River
Little Bighorn River
Merrimack River
Niobrara River
Passaic River
Pinto Creek (Arizona)
Potomac River
Skykomish River
Smith River (Montana)
South Fork Salmon River
Tallapoosa River
White Salmon River

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