FLOOD08612

• County: Gilpin
• Community: Black Hawk
• Stream Name: North Clear Creek
• Basin: South Platte
• Title: LOMR - Affected Panel 080076 0001 B - Case No. 01-08-251P
• Date: 3/1/2002
• Prepared For: Black Hawk
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

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Federal Emergency Management Agency
Washington, D,C. 20472

MAR 0 1 2002

RECEIVED
MAR 11 2002

CERTIFIED MAIL
RETURN RECEIPT REQUESTED

IN REPLY REFER TO:
Case No.: OI-08-251P

Colorado Water Conservation Board

The Honorable Kathryn Eccker
Mayor, City of Black Hawk
P.O. Box 17
Black Hawk, CO 80422

Community: City of Black Hawk, CO
Community No.: 080076
Panel Affected: OOOIB
E~ective.~ate of JUN 20 2002
This RevIsIOn:

102-I-A-C

Dear Mayor Eccker:

This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective
Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in
accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated
January 12,2001, Mr. Gary Thomas, P,E., Principal, MartinIMartin Consulting Engineers, requested that
FEMA revise the FIRM and FIS report to show the effects of construction of the Riviera Hotel and
Casino project along North Clear Creek. In addition, the revised hydraulic analysis incorporated removal
of the Main Street bridge; construction of the new Mill Street Bridge approximately 75 feet upstream of
the former Main Street bridge; updated topographic information; and channelization along North Clear
Creek from approximately 800 feet downstream to approximately 50 feet upstream of the former Main
Street bridge, as referenced on the effective FIRM. This request follows up on a Conditional Letter of
Map Revision issued on August 11, 1998,

All data required to complete our review of this request were submitted with letters from Mr. Thomas and
Ms. Jeanne M. Ratchford, P,E., Project Engineer, also with MartinIMartin Consulting Engineers.

We have completed our review of the submitted data and the flood data shown on the effective FIRM and
in the effective FIS report, We have revised the FIRM and FIS report to modify the elevations and
floodplain boundary delineations of the flood having a I-percent chance of being equaled or exceeded in
any given year (base flood) along North Clear Creek from approximately 950 feet downstream to
approximately 550 feet upstream of the former Main Street bridge. As a result of the modifications, the
Base Flood Elevations (BFEs) for North Clear Creek and the width ofthe Special Flood Hazard Area
(SFHA), the area that would be inundated by the base flood, increased in some areas and decreased in
other areas. The modifications are shown on the enclosed annotated copies of FIRM Panel 0001 B,
Profile Panels 01P and 02P, and affected portions of the Floodway Data Table. This Letter of Map
Revision (LOMR) hereby revises the above-referenced panel ofthe effective FIRM dated October 16,
1984, and the affected portions of the FIS report dated April 16, 1984,

The modifications are effective as of the date shown above, The map panel listed above and as modified
by this letter will be used for all flood insurance policies and renewals issued for your community.