FLOOD11728

• Designation Number: 106
• County: Mesa
• Community: Mesa County and Unincorporated Area
• Basin: Colorado Mainstem
• Title: FIS - Mesa County and Unincorporated Areas
• Date: 1/1/1978
• Designation Date: 5/12/1978
• Prepared For: Mesa County
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

The final community coordination meeting was held on April l8, 1977.
Members of the Mesa County Commission and representatives of the Mesa
County Planning Department, the Colorado Water Conservation Board,
the Federal Insurance Administration, the U.S. Army Corps of Engi-
neers, and local consulting engineers attended the meeting. No
criticism of the rE!port or data that would modify the findings of
the study were presented.

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1.3 Authority and AckncMledgments

The source of authority for this Flood Insurance Study is the National
Flood Insurance Act of 1968, as amended.

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The hydrologic and hydraulic analyses for this study were performed
by the U.S. Army Corps of Engineers, Sacramento District, for the
Federal Insurance Administration, under Inter-Agency Agreement Nos.
IAA-H-16-75 and IAA-H-7-76, Project Order Nos. 21 and 1, respectively.
This work, which was completed in November 1976, covered all signifi-
cant flooding sources affecting the unincorporated areas of Mesa
County.

2.0 AREA STUDIED

2.1 Scope of Study

This Flood Insurance Study covers the unincorporated areas of Mesa
County, Colorado. Areas not included in this study include the Towns
of Collbran, De Beque, Fruita, and Palisade; the City of Grand Junc-
tion; White River, Grand Mesa, Uncompahgre, and Manti-La Sal National
Forests, and Colorado National Monument. The area of study is shown
on the Vicinity Map (Figure 1).

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Because of substantial development in the Grand Junction area and
anticipated development in the Gateway area, it was agreed by the
county, the State, the Federal Insurance Administration, and the U.S.
Army Corps of Engineers that selected streams in those areas would be
studied by detailed methods. Negligible development is projected in
other areas of the county. The streams and watercourses agreed upon
for study by either detailed or approximate methods are shown in
Table 1.

Those areas studied by detailed methods were chosen with considera-
tion given to all proposed construction and forecasted develop~ent
through 1981.

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