Whaley #13 Reservoir Report
Nearby: Whaley #11 Dam Ulmer Lake
Last Updated: December 8, 2025
Whaley #13 is a private earth dam located in Rosebud, Montana, specifically in the city of CARTERSVILLE.
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Summary
Completed in 1974, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a dam height of 20 feet and a length of 900 feet, Whaley #13 has a storage capacity of 128 acre-feet and a normal storage level of 79 acre-feet. The dam is primarily regulated by the Montana Department of Natural Resources and Conservation (DNRC), with state jurisdiction, permitting, inspection, and enforcement in place to ensure its safety and compliance.
Situated on TR-RATTLESNAKE CREEK, Whaley #13 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite not having a designated emergency action plan (EAP) or updated contact information, the dam continues to provide essential services for the surrounding area. With its location in Congressional District 00, Montana, under the representation of Greg Gianforte (R), Whaley #13 stands as a vital water resource infrastructure for the community, contributing to fire protection and supporting local agricultural activities. Enthusiasts of water resources and climate will find Whaley #13 to be a fascinating example of a privately owned dam with significant implications for water management in the region.
Year Completed |
1974 |
Dam Length |
900 |
Dam Height |
20 |
River Or Stream |
TR-RATTLESNAKE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
128 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Whaley #13