PROJ00382

• Contract/PO #: C153685
• Contractor Name: Monument, Town of
• Contract Type: Loan
• Water District: 10
• County: El Paso
• Bill Number: SB 94-029
• Loan Projects - Doc Type: Feasibility Study

Monument Lake Dam Feasibility Study

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Chapter III - Background Information

considered to be satisfactory. However, because of the erosion damages downstream of the

structure, the overall condition of the spillway is considered poor.

The outlet works for Monument Lake DQm consists of twin 16-inch pipes located at the

bottom of the embankment. The intakes of the pipes were not observed because they were under

water. A gate chamber is located in the dam crest. The gate chamber is apparently housing the

control valves fotthe outlet pipes, and access to the bottom of the chamber is by means of a

metal ladder. Because of safety concerns, we did not inspect the inside ofthe chamber. The

outlet pipes terminate through a masonry headwall at the downstream toe of the embankment.

According to the Town, the left valve cannot be completely closed, and flows inside the left pipe

could not be shut off. We did not operate either valve during our inspection. Based on these

observations, the conditions of the outlet works are considered to be very poor.

No instrumentation was observed in MOnument Lake Dam. The observation wells

installed in the embankment in 1974 by Nelson, Haley, Patterson, and Quirk were not found

during the inspection.

D. Water Demands

The purpose of this project is strictly limited in scope to the rehabilitation of Monument

Lake Dam. The reservoir is used for recreationQI purposes. The reservoir is filled and

maintained by snowmelt and stormwater runoff. The reservoir is maintained at the restricted

level by releasing water through the outlet works. The reservoir is presently not used for

irrigation, industrial or municipal use, and as SUch, no releases are made from the reservoir to

meet these types of demands. No additional water supplies will be developed in connection with

this project. No new or increased diversions will be made. The reservoir capacity will be

regained through dredging operations. The uses of the water from Monument Lake will not

change as a result of this project.