Twin Dam #1 Reservoir Report
Last Updated: February 6, 2026
Twin Dam #1, located in Rosebud, Montana, is a private earth dam designed by the USDA NRCS and completed in 1959 for the primary purpose of irrigation.
Summary
Situated on Coyote Creek, this dam stands at a height of 15 feet and has a length of 200 feet, providing a maximum storage capacity of 67 acre-feet. With a drainage area of 8.44 square miles and a maximum discharge of 1000 cubic feet per second, Twin Dam #1 plays a crucial role in water resource management in the region.
Managed by the DNRC, Twin Dam #1 has been deemed to have a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. While the dam has not undergone recent inspections or assessments, it is maintained in compliance with state regulations, including permitting, inspection, and enforcement. With its strategic location and efficient design, Twin Dam #1 serves as a vital infrastructure for supporting agricultural activities and ensuring water availability in the area.
Despite its age, Twin Dam #1 continues to fulfill its intended purpose of irrigation, contributing to the sustainable use of water resources in Montana. As a key component of the local water management system, this dam underscores the importance of proper infrastructure maintenance and regulatory oversight in safeguarding against potential risks and ensuring the resilience of water resources in the face of climate variability and change.
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°F
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Wind
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Humidity
15-Day Weather Outlook
Year Completed |
1959 |
Dam Length |
200 |
Dam Height |
15 |
River Or Stream |
COYOTE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Drainage Area |
8.44 |
Nid Storage |
67 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Santee River Nr Jamestown
|
1050cfs |
Black River At Kingstree
|
718cfs |
Lake Moultrie Tailrace Canal At Moncks Corner
|
1320cfs |
Santee River Near Pineville
|
642cfs |
Turkey Creek Near Maryville
|
1cfs |
Back River At Dupont Intake Nr Kittredge
|
3370cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Billy Cox Lower Pond Dam