Summary
This dam, situated on Dry Fork Coulee, has a height of 20 feet and a length of 600 feet, providing a storage capacity of 62 acre-feet. With its low hazard potential and a state-regulated status, Tryannosaurus is under the jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC), with state permitting, inspection, and enforcement in place.
Despite its age, Tryannosaurus has not been assessed for its current condition and is labeled as "Not Rated." The dam does not have an Emergency Action Plan (EAP) prepared, and there is no information available on risk assessment or management measures. However, with its location in a region prone to dry conditions and potential water scarcity due to climate change, water resource and climate enthusiasts may find Tryannosaurus an intriguing case study for understanding the maintenance and resilience of aging infrastructure in the face of evolving environmental challenges.
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15-Day Weather Outlook
Year Completed |
1953 |
Dam Length |
600 |
Dam Height |
20 |
River Or Stream |
DRY FORK COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Missouri River At Virgelle Mt
|
7350cfs |
Teton River At Loma Mt
|
127cfs |
Marias River Near Loma Mt
|
451cfs |
Missouri River At Fort Benton Mt
|
5620cfs |
Big Sandy Creek Near Havre Mt
|
6cfs |
Marias River Near Chester Mt
|
257cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Coal Banks Landing
|
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LITTLE SANDY COULEE REC SITE
|
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LONE TREE COULEE
|
Tryannosaurus