9705

• UCREFRP Catalog Number: 9705
• Author: Green River Study Plan ad hoc Committee.
• Title: Study plan for the implementation and evaluation of flow and temperature recommendations for endangered fishes in the Green River downstream of Flaming Gorge Dam.
• USFW Year: 2007.
• USFW - Doc Type: Upper Colorado River Endangered Fish Recovery Program
• Copyright Material: NO

GREEN RIVER STUDY PLAN

21

February 2,2007

Table 2. Eighteen highest ranked anticipated effects and uncertainties (hypotheses), listed by
resource category' (i.e., floodplains, backwaters, etc.), related to flow and temperature
recommendations for the Green River downstream of Flaming Gorge Dam, studies that address
hypotheses, and topics not addressed by existing studies.

Primary Studies Topic Not
Addressed by
Anticipated Effects and Uncertainties (Hypotheses) That Address Studies (information
Hypothesis needs)
Floodplains in Reach 2
U6. Flow and stage at which floodplains with levee breaches . Cap 6-rz . Movement of
become sufficiently inundated (area, depth, volume) to provide . Cap 6-bt/rz subadult RBS
nursery habitat for razorback suckers (U.S. Fish and Wildlife . Cap 6-rz/bt (razorback sucker)
Service 2005). . Cap 6-rz/entr into the river.
. Cap 6 HYD . Habitat quality.
. Western aerial
photography
A5. Wet and Moderatelv Wet: Significant inundation of . Cap 6-rz . Movement of
floodplain habitat and off-channel habitats (e.g., tributary . Cap 6-bt/rz subadult RBS into
mouths and side channels) to establish river-floodplain . Cap 6-rz/bt the river.
connections and provide warm, food-rich environments for . Cap 6-rz/entr . Habitat quality.
growth and conditioning of razorback suckers (especially young) . Cap 6 HYD
and Colorado pikeminnow. . Western aerial
Average: Significant inundation of floodplain habitat and off- photography
channel habitat in at least I of 4 average years; some flooding of . Stocked fish
off-channel habitats in all years. evaluation
Moderatelv Dry and Drv: No floodplain inundation, but some . Project 128
flooding of off-channel habitats. May benefit recruitment of
Colorado pikeminnow in some years (Muth et al. 2000).
U7. Area, depth, volume, and persistence of floodplain . Cap 6-rz . Intra and inter-
depression habitat after peak flows recede and the relationship, . Cap 6-bt/rz annual persistence of
if any, between these and the magnitude ofthe peak flow (U.S. . Cap 6-rz/bt water in floodplains.
Department of the Interior 2005; U.S. Fish and Wildlife Service . Cap 6-rz/entr
2005). . Cap 6 HYD
. Western aerial
photography
. Evaluation of
restoration and
management
options for Ouray
NWR
U9. Entrainment and retention of larvae in floodplain nursery . Cap 6-rz . None.
habitats as a function of the physical characteristics of the . Cap 6-rz/entr
habitat including size, volume, local hydraulic conditions, . Cap 6 HYD
inlet(s), and outlet(s) (U.S. Fish and Wildlife Service 2005). . Evaluation of
restoration and
management
options for Ouray
NWR .