FLOOD06965

• County: Adams
• Community: Northglenn, Thornton
• Stream Name: Grange Hall Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 12/1/1977
• Prepared For: Adams County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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10. Thornton Reach 2S -- Street Crossings and 173,700 (I) Street crossing improvements to reduce the flooding of streets and associated
Channel Improvements
Reach 2N -- Street Crossings 166,500 damages.
II. Northglenn and
Channel Improvements (2) Channel improvements which include channelization, channel lining, trickle
12. Adams Caunty Reach 2SE n Channel Improvements 8,500 flow channels, check drop structures, storm sewers, etc.
13. Northglenn Reach IS n Street Crossings and 979,800 (3) Improvements to existing ponds, dam embankments, and spi IIways.
Channel Improvements

*Includes construction, contingency, engineering and construction services, and
right-of-way acquisition.

The recommended order of priority was established based on the present overage

annual damage and the improvement effectiveness.

The lower items of priority are not critical to the phose of implementotion and the

lower priority items generally ore located in the lower reaches of Grange Hall Creek at its

tributaries where the population density is much lower.

E. Recommendations

This report represents the culmination of several studies on the flooding potential of

Grange Hall Creek and its tributaries. The studies hove included hydrologic studies,

hydraulic studies, potential flood damage studies, flood plain improvement studies, cost

evaluation studies, and other studies related to the above.

The main purpose of the studies on Grange Hall Creek was to develop feasible

alternatives for consideration by Adams County, Northglenn, Thornton, and the U.D. and

F.C.D. for possible implementation to eliminate existing and future flood hazards and to

reduce flood damage costs associated with Grange Hall Creek. The preliminary design of

the accepted alternative has been completed and is included as port of this report.

The alternative selected for each reach of Grange Hall Creek and its tributaries

consists in general of the following:

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