9388

• UCREFRP Catalog Number: 9388
• Author: Maddux, H. R., W. R. Noonan and L. A. Fitzpatrick.
• Title: Overview of the Proposed Critical Habitat Designation for the Four Colorado River Endangered Fishes.
• USFW Year: 1993.
• USFW - Doc Type: Salt Lake City.
• Copyright Material: NO

Critical habitat for each species is summarized by State in Table 3 and by shoreline
ownership in Table 4. The loo-year floodplain delineates the lateral boundary of the
proposed critical habitat for the razorback sucker and Colorado squawfish. This boundary
encompasses the productive areas adjacent to the rivers that provide essential food resources
for various life stages of the fish, and it includes the mouths of smaller tributaries and other
habitats that provide essential fish habitat when seasonally inundated.

Table 3. Critical habitat for four endangered Colorado River fishes (in river miles!).

STATE RAZORBACK COLORADO HUMPBACK BONYTAlL STATE
SUCKER SQUA WFISH CHUB TOTALS'
COLORADO 217 362 59 59 362
UTAH 688 726 139 139 728
NEW MEXICO 39 60 ----- ------- 60
ARIZONA 617 ------ 181 ------- 617
AZlNEVADA 130 ------ ------ 82 130
A7JCALIFORNIA 133 ------ ------ 64 197
BASIN TOTAL 1,824 1,148 379 344 2,094

I - The river distances shown in this table were compiled using total shoreline miles (assuming I mile of river centerline has 2 miles of
shoreline) for each proposed critical habitat reach. Because of rounding differences, numbers in this table may not exactly match those
proposed for each species. There is considerable overlap of proposed critical habitat reaches between species; thus, total miles of critical
habitat for all four Colorado River endangered fishes proposed to be designated cannot be obtained from this table.
2 - State totals do not equal the cumulative totals of the four species due to extensive overlap between species.

Table 4. Ownership of shoreline (in miles) for proposed critical habitat for the endangered
Colorado River. fishes I,

OWNERSHIP' II RAZORBACK SUCKER II COLORADOSQUAW~H I HUMPBACK r BONYTAIL
CHUB
NPS 1215 559 338 426
BLM 713 695 126 83
USFS 286 ---- ----- -----
USFWS 99 22 ----- 25
TRrnAL 620 280 276 86
STATE LANDS 43 49 <I 25
PRIVATE 673 691 17 37
TOTAL 3.649 2,296 758 682

I - The river distances shown in this table were compiled using total shoreline miles (assuming I mile of river centerline has 2 miles of
shoreline) for each proposed critical habitat reach. Because of rounding differences, numbers in this table may not exactly match those
proposed for each species. There is considerable overlap of proposed critical habitat reaches between species; thus, total miles of critical
habitat for all four Colorado River endangered fishes proposed to be designated cannot be obtained from this table.
2 - NPS--National Park Service; BLM--Bureau of Land Management; USfS--U.S. forest Service; USFWS--U.S. fish and Wildlife Service.

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