Senac Reservoir Report

Last Updated: December 5, 2025

Senac, also known as Aurora Dam, is a vital water resource located in Arapahoe County, Colorado.


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Summary

Built in 1990 for the primary purpose of water supply, Senac Dam stands at an impressive height of 131 feet and has a maximum storage capacity of 40,400 acre-feet. The dam, situated on Senac Creek, plays a crucial role in providing water to the surrounding area and also offers recreational opportunities.

Managed by the local government and regulated by the Colorado Division of Water Resources, Senac Dam has a high hazard potential but is currently in satisfactory condition. With a spillway width of 70 feet and a maximum discharge of 9,000 cubic feet per second, the dam is equipped to handle potential emergencies. Regular inspections ensure the safety and reliability of the structure, with the last assessment conducted in September 2020.

Climate enthusiasts and water resource experts alike can appreciate the significance of Senac Dam in maintaining water supply and supporting recreational activities in the region. Its strategic location and impressive design make it a key asset for water management in Colorado, highlighting the importance of infrastructure in adapting to climate change and ensuring sustainable water resources for the future.

Year Completed

1990

Dam Length

8400

Dam Height

131

River Or Stream

SENAC CREEK

Primary Dam Type

Earth

Surface Area

820

Hydraulic Height

122

Drainage Area

4

Nid Storage

40400

Structural Height

163

Hazard Potential

High

Nid Height

163
       
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.