Gregg #1 Reservoir Report
Nearby: Montana #28 Severson #4
Last Updated: December 6, 2025
Gregg #1, located in Forsyth, Montana, is a privately owned earth dam completed in 1960 for fire protection, stock, and small fish pond purposes.
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Summary
This dam stands at a height of 22 feet and has a storage capacity of 95 acre-feet, with a normal storage level of 36 acre-feet. Situated on TR-Indian Creek, this structure serves as a crucial resource for water management in the region, with a low hazard potential and state-regulated jurisdiction.
Managed by the DNRC and falling under the oversight of the state of Montana, Gregg #1 plays a vital role in maintaining water resources and supporting various uses in the area. Despite being classified as 'Not Rated' in terms of condition assessment, the dam continues to fulfill its intended purposes effectively. With a prime location in Garfield County and proximity to the Omaha District, the dam serves as an essential piece of infrastructure for the community.
As a significant element in the water resource and climate landscape of Montana, Gregg #1 represents a key example of private ownership contributing to water management and conservation efforts. Its role in fire protection, stock maintenance, and small fish pond support underscores the multifaceted benefits that dams can provide. With state regulation and inspection ensuring its continued functionality, this earth dam stands as a testament to the importance of sustainable water resource management in the region.
Year Completed |
1960 |
Dam Length |
270 |
Dam Height |
22 |
River Or Stream |
TR-INDIAN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
95 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
Gregg #1