Aurora-Rampart Reservoir Report

Last Updated: December 5, 2025

Aurora-Rampart is a significant water supply dam located in Douglas County, Colorado, specifically in the city of Kassler.


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Summary

Built in 1964, this earth dam stands at a height of 48 feet with a hydraulic height of 52 feet and a structural height of 62 feet. It serves the primary purpose of water supply and has a storage capacity of 1,596 acre-feet, with a normal storage level of 1,200 acre-feet.

The dam is situated on Willow Creek-OS and is regulated by the Department of Water Resources (DWR) in Colorado. With a spillway type of uncontrolled and a spillway width of 52 feet, Aurora-Rampart has a hazard potential rated as significant, although its condition assessment is deemed satisfactory as of the last inspection in June 2019. The risk assessment for the dam is moderate (3), indicating a level of potential risk that is being managed effectively.

This structure, owned by the local government, plays a crucial role in supplying water to the surrounding area and ensuring water resource management. With its strategic location and design features, Aurora-Rampart stands as a vital component of the water infrastructure in the region, contributing to the sustainable management of water resources in Colorado.

Year Completed

1964

Dam Length

2000

Dam Height

48

River Or Stream

WILLOW CREEK-OS

Primary Dam Type

Earth

Surface Area

66

Hydraulic Height

52

Nid Storage

1596

Structural Height

62

Hazard Potential

Significant

Nid Height

62
       
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.