Gartside Reservoir Report
Nearby: Hastetter #2 Hastetter #1
Last Updated: December 15, 2025
Gartside, located in Richland County, Montana, is a state-owned recreational dam on Crane Creek with a maximum storage capacity of 872 acre-feet and a normal storage of 326 acre-feet.
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Summary
Built in 1962, this earth dam stands at a height of 31 feet and spans 1350 feet in length. With a hazard potential rated as high, Gartside has a spillway width of 144 feet and a maximum discharge capacity of 13040 cubic feet per second.
Despite its high hazard potential, Gartside has been assessed as being in satisfactory condition as of January 2021. The dam is inspected every 5 years, with the last inspection conducted in August 2021. In case of emergencies, the dam is equipped with slide (sluice gate) outlet gates. The risk assessment for Gartside is moderate, indicating a need for ongoing monitoring and management to ensure the safety of the surrounding area.
Overall, Gartside serves as a vital resource for recreational activities in the region while also playing a crucial role in water management and flood control. With its strategic location and essential functions, Gartside is a key asset for the state of Montana and underscores the importance of maintaining and monitoring dams to safeguard communities and the environment.
Year Completed |
1962 |
Dam Length |
1350 |
Dam Height |
31 |
River Or Stream |
CRANE CREEK |
Primary Dam Type |
Earth |
Surface Area |
41 |
Hydraulic Height |
30 |
Drainage Area |
32.5 |
Nid Storage |
872 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
31 |
Seasonal Comparison
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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.
Gartside