2012-03-07_PERMIT FILE - C2010088 ‎(27)‎

• Permit No: C2010088
• IBM Index Class Name: Permit File
• Doc Date: 3/7/2012
• Doc Name: Bridge Evaluation for 100-year event
• Section_Exhibit Name: Exhibit 18
• Media Type: D
• Archive: No

FRUITA LOADOUT FACILITY
Reed Wash 100 Year Floodplain Developed Conditions
EXECUTIVE SUMMARY
Revised August 8t', 2011
1.0 STUDY AREA
1.1 General Description
Reed Wash has a drainage area of approximately 30.23 square miles, generally running
from the north to the south and ending at it's confluence with the Colorado River
approximately 3.8 miles west of the City of Fruita, Colorado. FEMA defines the
floodplain of Reed Wash in the area of the project as being a Zone A, Special Flood
Hazard Area (SFHA) for which no base flood elevations have been determined.
Currently there exists one 14' x 10' concrete box culvert crossing at State Highway 6 &
50 north of the project site and a bridge crossing of Interstate 70 south of the project site
at the confluence with the Colorado River. The detailed study prepared for the
Conditional Letter of Map Revision, CLOMR request begins generally at the confluence
of the Colorado River and specifically at the "Limits of the Detailed Study" of the
Colorado River as shown on the FIRM Map, Appendix RW -A and the Reed Wash 100
Year Floodplain Drawings, Appendices RW -B and RW -C of the CLOMR request. This
downstream study limit is located approximately 1,172 feet upstream and northeast of
the bridge crossing of Interstate 70. The detailed study of Reed Wash includes a
channel reach length of approximately 7,936 feet, (1.50 Miles), terminating at a point
approximately 856 feet southwest of the box culvert crossing at State Highway 6 & 50.
1.2 Nature of Proposed Development
The activity associated with the Fruita Loadout Facility potentially affecting the Reed
Wash Floodplain will be the construction of a railroad bridge to be located approximately
3,343 feet upstream and northeast of the bridge crossing of Interstate 70.
1.3 Detailed Description of Attached CLOMR Exhibits
Table RW -1 Reed Wash Base Flood Elevations for Historic (HC) and Developed (DC)
Conditions, documents the calculated difference (increase) is Base Flood Elevations
between the (HC) and post construction (DC) conditions.