7832

• UCREFRP Catalog Number: 7832
• Author: U.S. Bureau of Reclamation.
• Title: A Pilot For Long-Term Monitoring Of Resources On The Colorado River In The Grand Canyon Using Geographic Information Systems.
• USFW Year: 1995.
• USFW - Doc Type: \
• Copyright Material: NO

2) The importance of the data set to the integration of other studies or analyses.
3) The compatibility accuracy of the data set with the level of accuracy required within the
GCES/GIS.
4) The amount of editing necessary to bring the data set into a useful state.
The remaining studies will be integrated into the data base on an as-needed and availability
basis.
Of the 14 data sets used in the site No. 5 pilot, 7 data sets were used to illustrate the analytical
capabilities of the GCES/GIS and its applicability for protocol development.
A. Aquatics
1. Bathymetric and thermal mapping at the confluence of the Colorado and Little Colorado
Rivers, cross-referenced to indicate relationships and trends.
2. Data collected primarily to address questions regarding the endangered Humpback chub
(Gila cypha), including:
a. Net set locations with catch data from individual research trips.
b. Velocity contour maps at high and low flow, defining habitats in the current.
c. Shoreline habitat maps.
d. Radio telemetry information.
e. Minnow trap locations.
f. The thermal boundary at the confluence of the Colorado and Little Colorado Rivers
measured and delineated under different flow levels to identify optimum thermal
habitat for the Humpback Chub. This information will be combined with
bathymetry, radio-telemetry, and net set data to better identify habitat availability
and use.
g. River channel boundary at 5000, 15000, and 30000 ft3/s.
B. Terrestrial
1. Vegetation polygon data analyzed from aerial photography from 1963, 1984, 1990, and
1992 to identify trends in post-dam vegetation growth.
C. Sediment
1. Detailed sandbar surveys correlated with daily photographs of the subject sites to track
sediment aggradation and degradation at sites throughout the canyon.
2. A data set which monitors sediment movement throughout the canyon. Collection
methods included total station topographic surveys, bathymetric surveys, and
rectification of photographs taken daily during the time of lowest flow. These methods
were combined for a comprehensive look at sedimentation patterns.
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