7273

• UCREFRP Catalog Number: 7273
• Author: Prewitt, C. G., E. J. Wick and D. E. Snyder.
• Title: Population and Habitat Monitoring Program for the Endangered Humpback Chub ‎(
• USFW Year: 1978.
• Copyright Material: NO

it,
Water quantity impacts:
1. Irrigation diversions.
2. Headwaters storage reservoirs.
3. Out of basin diversions to oil shale processing areas.
Land-use impacts:
1. Intensive grazing, diversion and irrigation.
Palisade to Clifton Trend Zone
This river reach begins immediately below the Farmer's Canal irrigation
diversion structure in Palisade, Colorado. The river's left bank borders the
escarpment to East Orchard Mesa throughout all but a few hundred meters of the
trend zone (Table 3). Where the river contacts the foot of the escarpment it
flows across smooth,consolidated sedimentary rock. Considerable depths were
encountered near the left bank at these areas. At all other areas, the substrate
was large cobble, sand and mud. Offstream activities were intense, and noted
on the trend zone maps.
Major backwater areas were noted at B and C. The backwater at B was the
result of the construction of a road across the upper portion of a chute
channel. The resultant reduction in flow has allowed the establishment of
emergent vegetation in the depositional substrate. The backwater at C is
a natural side-channel which has been dammed near the downstream end with
piles of large cobbles.
Major positive habitat attributes:
1. Two large backwater areas (at stations B and C) offer-
ing large areas of standing water habitat.
2. Deep water areas near the foot of East Orchard Mesa
escarpment.
Major causes for concern:
1. Extreme dewatering during low flow years due to effects
of Farmer's canal diversions.
..