Summary
Built in 1965 for fire protection, stock, and small fish pond purposes, Spider One stands at a height of 10 feet and has a storage capacity of 62 acre-feet. Despite its relatively low hazard potential, the dam is 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 in Blaine County, Montana, Spider One is under the oversight of the Omaha District of the US Army Corps of Engineers, with a primary purpose of serving as a protective barrier for the local community. The dam has a normal storage capacity of 32 acre-feet and covers a length of 180 feet. While its condition assessment is currently marked as "Not Rated," Spider One's hazard potential is rated as low, reflecting the careful monitoring and management measures in place to mitigate any potential risks. With its strategic location and vital role in fire protection and agriculture, Spider One is a significant water resource structure contributing to the sustainability and resilience of the local ecosystem.
Year Completed |
1965 |
Dam Length |
180 |
Dam Height |
10 |
River Or Stream |
TR-WOODY ISLAND COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Milk River Near Harlem Mt
|
69cfs |
Battle Creek Near Chinook Mt
|
12cfs |
Clear Creek Near Chinook Mt
|
21cfs |
Milk River Near Dodson Mt
|
68cfs |
Peoples Creek Near Hays Mt
|
4cfs |
Milk River At Havre Mt
|
29cfs |
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.
Spider One