South Platte Reservoir Reservoir Report

Last Updated: December 5, 2025

South Platte Reservoir, located in Arapahoe County, Colorado, is a crucial water supply reservoir managed by the local government.


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Summary

Constructed in 2007 by TETRA TECH RMC, this reservoir on the South Platte River has a dam height of 64 feet and a maximum storage capacity of 7,435 acre-feet. The reservoir covers a surface area of 152 acres and serves the primary purpose of water supply for the region.

With a spillway width of 522 feet and a maximum discharge capacity of 13,045 cubic feet per second, South Platte Reservoir is equipped to manage high hazard potential. Despite this, the condition assessment of the reservoir as of March 2020 was rated as satisfactory. The risk assessment for the reservoir is moderate, and it undergoes regular inspections and is subject to state regulation and enforcement, ensuring its safe operation for water resource and climate enthusiasts who rely on its critical role in water supply management in the region.

Year Completed

2007

Dam Length

7700

Dam Height

64

River Or Stream

SOUTH PLATTE RIVER-OS

Primary Dam Type

Earth

Surface Area

152

Hydraulic Height

48

Drainage Area

4

Nid Storage

7435

Structural Height

83

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

83
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.