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

Table AI. Goals, objectives, and status for studies (primary studies in bold text) relevant to evaluation of the Green River flow and
temperature recommendations. See Tables A2-A4 for links of studies to flow and temperature recommendations, and anticipated
effects or uncertainties.

Studies
Gunnison and Green
River sediment
monitoring (project
85t)

Study Goal and Ob.iectives

Goal
The goal of the sediment monitoring program is to provide information with which to evaluate
changes in the magnitude, timing, and size distribution of sediment delivery to the Gunnison
and Green River systems and their potential effects on the riverine ecosystem, specifically as
they relate to recovery of the endangered fishes.
Obiectives
1. A retrospective analysis of historic sediment data will be done to determine the availability
of historic sediment data for the key sites on the Colorado, Gunnison, and Green River near
Green River Utah. This objective also includes an evaluation of the data to determine their
utility for developing sediment-transport equations (These were completed and presented at the
habitat workshop in March 2005). In addition, an evaluation of trends in sediment transport,
and how variations (wet vs. dry years) in annual hydrographs affect sediment transport will be
included in the SIR (to be written in FY 2008).
2. To support the evaluation of the effects of streamflow and sediment movement on the
morphometric and bed material characteristics of Gunnison and Green River.
3. Determine ifthere is any distinction between sediment load estimates computed from daily
sediment data, sediment transport equations, and empirical bedload transport equations.
4. Evaluate the dynamics of sediment movement in the study reaches by collecting and
analyzing data to compute sediment load, including suspended sediment using daily samples
and sediment transport equations. Water-surface slope and bed-material samples will be
collected at two sites to support bedload calculations. These data will be collected at the
Whitewater gage and the Green River near Jensen Utah (Jensen). These sites represent the
range in sediment conditions found in other habitat monitoring reaches (primarily cobble
bottom in the Gunnison R. at Whitewater and a sand cobble mixture, primarily sand, found in
the Green R. near Jensen).
5. Collect necessary topology data near the Jensen site for use in a Surface Water Modeling
System (SWMS) Demonstration Project to determine the suitability ofthis type of modeling of
sediment transport as it relates to current and future efforts to monitor habitat for the
endangered fishes. An added utility of the proposed work is the opportunity, at a later date, to
incorporate output from the SWMS into existing habitat models to further relate streamflow
and sediment transport to recovery efforts for the endangered fishes.

Status
Ongoing

FY
2004 - 2008

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