Wyoming Ecological Services
Mountain-Prairie Region

Federally Listed, Proposed & Candidate Species | Species of Concern | Migratory Birds | All Species By County



Federally Listed, Proposed and Candidate Species


Colorado River Fish

Bonytail (Gila elegans) Status: Endangered
Coloradao Pikeminnow (Ptychocheilus lucius) Status: Endangered
Humpback Chub (Gila cypha) Status: Endangered
Razorback Sucker (Xyrauchen texamus) Status: Endangered



Colorado River Fish Area Of Influence

Section 7 Range Symbol

Wyoming Area Of Influence
Colorado River Fish

Potentail Distribution in Wyoming

For Species Lists, please use the IPaC System

Area Of Influence

Areas Of Influence (AOI) identify areas where any project located within should consider potential effects to the Threatened, Endangered, Proposed, and Candidate species and designated and proposed Critical Habitat, in reference to Section 7 of the Endangered Species Act of 1973, as amended.  AOI typically encompass larger areas than simply where the species is known to exist because of direct and indirect effects to the species and their habitat.  It is important to consider potential effects to the species and their habitat within these larger areas.  Action agencies are encouraged to refer to the Service’s Information, Planning, and Conservation System (IPAC) or contact the FWS Wyoming Ecological Services Office for additional information.  (AOI boundaries based on the best available data at time of development.  AOI will be updated as new information becomes available).

Download Area Of Influence GIS Data or Area Of Influence Google Earth layers


Species Information

Formal interagency consultation under section 7 of the ESA is required for projects that may lead to depletions of water from any system that is a tributary to the Colorado River.  Federal agency actions resulting in water depletions to the Colorado River system may affect the endangered bonytail (Gila elegans), Colorado pikeminnow (Ptychocheilus lucius), humpback chub (Gila cypha), and razorback sucker (Xyrauchen texanus) and their habitat downstream in the Green and Colorado River systems.  In addition, upstream depletions may contribute to the destruction or adverse modification of designated critical habitat for these four species.  Critical habitat is designated for Colorado River Fish in Colorado and Utah in downstream riverine habitat in the Yampa, Green, and Colorado River systems (see 50 CFR 17.95(e))

In general, depletions include evaporative losses and/or consumptive use of surface or groundwater within the affected basin, often characterized as diversions less return flows.  Project elements that could be associated with depletions include, but are not limited to, ponds (detention/recreation/irrigation storage/stock watering), lakes (recreation/irrigation storage/municipal storage/power generation), reservoirs (recreation/irrigation storage/municipal storage/power generation), hydrostatic testing of pipelines, wells, dust abatement, diversion structures, and water treatment facilities.  Any actions that may result in a water depletion should be identified.  The document should include an estimate of the amount and timing of average annual water use (both historic and new uses) and methods of arriving at such estimates; location of where water use or diversion occurs, as specifically as possible; if and when the water will be returned to the system; and the intended use of the water.  Depending upon the details of the project, the Service may have more specific questions regarding the potential consumptive use of water.

The Service, in accordance with the Upper Colorado River Endangered Fish Recovery Program, adopted a de minimis policy, which states that water-related activities in the Upper Colorado River Basin that result in less than 0.1 acre-foot per year of depletions in flow have no effect on the Colorado River endangered fish species, and thus do not require consultation for potential effects on those species.  Similarly, detention basins designed to detain runoff for less than 72 hours, and temporary withdrawals of water outside of critical habitat (e.g., for hydrostatic pipeline testing) that return all the water to the same drainage basin within 30 days, are considered to have no effect and do not require consultation.


Colorado River Fish Critical Habitat

Counties where effects to Colorado River Fish should be considered.

Carbon County | Fremont County | Lincoln County | Sublette County | Sweetwater County | Uinta County


Additional Information

Upper Colorado River Enadangerd Fish Recovery Program

Last updated: April 10, 2015