Scoping – Summary of the Federal Register Notice Input Received

Reclamation held a 60-day public scoping comment period and accepted scoping comments from June 16, 2023, through August 15, 2023. During this timeframe, Reclamation received 24,290 comment submissions, including 318 unique comment submissions from the public, Tribes, states, federal agencies, non-governmental organizations, and other stakeholders, 21,658 form letters, 1,256 form letters with unique content, and 1,058 duplicate submissions.

Reclamation published a Scoping Summary Report in October 2023. Links to the scoping submissions are available below for viewing.


Unique submissions were received from the Tribes and Tribal entities listed below.

Tribal Submissions

  • Colorado River Indian Tribes
  • Gila River Indian Community
  • Havasupai Tribe
  • Hopi Tribe
  • Hualapai Indian Tribe
  • Jicarilla Apache Nation
  • Navajo Nation
  • Paiute Indian Tribe of Utah
  • Pascua Yaqui Tribe
  • Quechan Indian Tribe
  • San Luis Rey Indian Water Authority
  • Southern Ute Indian Tribe
  • Tohono O'Odham Nation
  • Ute Indian Tribe
  • Ute Mountain Ute Tribe
  • Yavapai-Apache Nation

Federal, State, and Local Entities

Reclamation received unique submissions from governmental and quasi-governmental agencies, including basin states, federal agencies, state agencies and commissions, local water utilities, and irrigation districts.

Federal, State, and Local Entities Submissions (A-F)

Federal, State, and Local Entities Submissions (G-R)

Federal, State, and Local Entities Submissions (S-Z)

  • Arizona Department of Water Resources
  • Arizona Game and Fish Department
  • Arizona Power Authority
  • Arizona Re-consultation Committee Joint Letter: Arizona Water Company, City of Buckeye, City of Surprise, EPCOR Inc., Town of Marana, Town of Queen Creek, Water Utility of Greater Tonopah (Global Water Resources), City of Casa Grande, City of Maricopa, Pinal County, Town of Superior
  • Bard Water District
  • California Department of Water Resources
  • Central Arizona Project
  • Central Arizona Water Conservation District
  • Central Utah Water Conservancy District
  • City of Escondido and Vista Irrigation District
  • City of Goodyear
  • City of Phoenix
  • Colorado River Authority of Utah
  • Colorado River District
  • Colorado Water Conservation Board, Department of Natural Resources
  • Dolores Water Conservancy District
  • Environmental Protection Agency Region IX
  • Front Range Water Council
  • Gilbert Arizona Public Works
  • Helix Water District
  • Imperial Irrigation District
  • Imperial Valley Water (IVH2O)
  • Irrigation Districts Joint Letter: Central Arizona Irrigation and Drainage District, Maricopa-Stanfield IDD, New Magma IDD, Queen Creek ID, San Carlos IDD
  • Irrigation Districts Joint Letter: Wellton-Mohawk Irrigation and Drainage District WMIDD, Yuma Mesa IDD, Yuma Irrigation District, North Gila Valley IDD
  • Lake Havasu City
  • Metropolitan Water District of Southern California
  • Mohave County Water Authority
  • National Park Service
  • Nebraska Department of Natural Resources
  • Rio Blanco Water Conservancy District
  • Salt River Project
  • Salton Sea Authority
  • San Diego County Water Authority
  • San Juan Water Commission
  • Southern Nevada Water Authority
  • Southwestern Water Conservation District
  • State of Arizona
  • State of California
  • State of Colorado
  • State of Nevada
  • State of Nevada Colorado River Commission
  • State of New Mexico
  • State of Utah
  • State of Wyoming
  • Unit B Irrigation and Drainage Districts
  • Upper Colorado River Commission
  • U.S. Fish and Wildlife Service
  • Washington County Water Conservancy Districts
  • Western Area Power Administration


Unique submissions were received from the non-governmental organizations and other stakeholders listed below.

Organization Submissions (A-F)

Organization Submissions (G-K)

Organization Submissions (L-S)

Organization Submissions (T-Z)

  • AGESS, Inc.
  • American Rivers
  • American Whitewater
  • Amwua One for Water
  • Arizona Farm Bureau Federation
  • Arizona Municipal Power Users Association
  • Arizona State University
  • Association of Metropolitan Water Agencies
  • BlueRibbon Coalition
  • Bonneville Environmental Foundation
  • Center for Biological Diversity
  • Comite Civico Del Valle
  • Colorado River Energy Distributers Association
  • Dolores River Boating Advocates
  • Environmental Defense Fund
  • Front Range Water Council
  • Geothermal Worldwide, Inc.
  • Getches-Wilkinson Center for Natural Resources, Energy, and Environment, Colorado School of Law
  • Glen Canyon Institute
  • Grand Canyon Private Boaters' Association
  • Grand Canyon River Guides, Inc.
  • Grand Canyon State Electric Cooperative Association
  • Grand Canyon Trust
  • Grand Canyon Wildlands Council
  • Great Basin Water Network
  • Home Builders Association of Central Arizona
  • Imperial County Farm Bureau
  • Irrigation & Electrical Districts Association of Arizona
  • Joint Submission: Gadsden Company, Sonoran Wines, Cruz Farm, Greater Kingman Area Chamber of Commerce, Bullhead City Chamber of Commerce, Greater Flagstaff Area Chamber of Commerce
  • Lahontan Audubon Society
  • Las Vegas Water Defender
  • Living Rivers
  • National Audubon Society
  • National Parks Conservation Association
  • National Wildlife Federation
  • Natural Resources Defense Council
  • Oceanforesters
  • Pacific Institute
  • Pronatura Noroeste
  • Redford Center
  • Restauremos el Colorado
  • Returning Rapids Project
  • River Runners for Wilderness
  • Save the Colorado
  • Sierra Club Grand Canyon
  • Sonoran Institute
  • Southern Arizona Home Builders Association
  • Southwest Hydrology & Hydraulics, LLC
  • Stout Research Center
  • The EcoMedia Compass
  • The Nature Conservancy
  • Theodore Roosevelt Conservation Partnership
  • Trout Unlimited, Angler Conservation Program
  • University of Arizona
  • University of New Mexico
  • University of Nevada, Reno
  • Utah Rivers Council
  • Waterkeeper Alliance
  • Western Resource Advocates
  • Yampa-White-Green Basin Roundtable
  • Yuma County Water Users' Association


Unique submissions were received from more than 200 individuals.

Individual Submissions (List of senders is included at the beginning)

Form Letters

Form letters are submittals from multiple entities or individuals containing identical or similar content. Reclamation received 7 form letter submissions from more than 21,000 senders. Reclamation also received more than 1,200 form letter submissions with additional unique content.

Base Form Letter Submissions

Last Updated: 12/7/23