FLOOD05827

• County: Boulder
• Community: Boulder
• Stream Name: Boulder Creek
• Basin: South Platte
• Title: Boulder Creek Phase B
• Date: 12/1/1979
• Prepared For: Boulder
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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In 1961, the U.S. Geological survey prepared flood frequency

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In 1938, the Corps of Engineers prepared a "308" report on navi-

information for the portion of Boulder Creek upstream from 28th

gation, flood control, power development, and irrigation within the

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Street.

Platte River basin, Colorado, Wyoming, and Nebraska. The report

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recommended no construction for Boulder.

In 1967, the Bureau of Reclamation completed a reconnaissance

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TABLE I V .1

report entitled "St. Vrain Unit, Colorado". This report mentions

several damsites upstream from Boulder. Some of the damsites were

Summary of Boulder Flood Studies

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Completion
Date

Performed By

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1910
1945
1961

Frederick Law
Olmsted, Jr.
Corps of Engineers

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U.S. Geological
Survey
Bureau of Reclamation
Corps of Engineers
Consulting Firm

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1967
1969
1969

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1970

Consulting Firm

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1970
1972

Corps of Engineers
Corps of Engineers

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1973

Committee on Environ-
ment Planning
Corps of Engineers

1977

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found infeasible while others were not investigated. Little interest

Product

was shown in implementation.

Flood Plain Use Warning in
Planning Report
Flood Control Plan for 12,000
c.f.s. Discharge
Flood Plain Delineation

In the aftermath of the May 1969 flood, the Corps of Engineers

prepared a Flood Plain Information Report of Boulder in August of

Reconnaissance Report - Damsite
Flood Plain Information Report
Prel iminary Master Plan for
Boulder Creek from 24th to
30th Streets
Conceptual Plan for Boulder
Creek from 9th to 14th Street
Reconnaissance Report
Special Flood Hazard Information
Report
CECEP Plan Concept

1969. The hydrology of the Boulder Creek basin was studied during

the preparation of this report and the lOO-year discharge was

estimated at 7,400 c.f.s. using regional stream gaging records and

statistical methods.

In November of 1969, Wright-McLaughl in Engineers prepared a pre-

Metro Denver Urban Study

I iminary Master Plan for Boulder Creek from 24th Street to 30th

Street based on an estimated 100-year discharge of 7,400 c.f.s.

In August of 1945 the Corps of Engineers completed a survey report

The main features of this plan were improved crossings at 24th,

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entitled "South Platte River and Tributaries, Colorado, Wyoming and

28th, and 30th Streets; the removal of the existing diversion

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Nebraska" that was pub 1 i shed as House Document 669 by the 80th

structure immediately downstream of 28th Street; together with

Congress, 2nd Session in 1948. This survey report, in part, out-

lowering the overbank elevations to create on excavated channel.

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1 ined a plan of improvements for the protection of Boulder against

the flood of record on Boulder Creek and lower Sunshine Creek. The

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In 1970, Wright-McLaughl in Engineers prepared a Conceptual Plan for

recommended Boulder Creek Local Protection Project was authorized

Boulder Creek from 9th to 14th Streets based on a 100-year discharge

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for construction by the Flood Control Act of 1950.

of 7,400 c.f.s.

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