Summary
Completed in 1981, this earth dam structure stands at a height of 38.5 feet, with a hydraulic height of 34 feet and a length of 3800 feet. The lagoon has a storage capacity of 900 acre-feet and covers a surface area of 38 acres, drawing water from unnamed streams and the Blackfoot River for irrigation needs.
Managed by a private owner, the Simplot Effluent Irrigation Lagoon is regulated by the Idaho Department of Water Resources, ensuring proper permitting, inspection, and enforcement measures are in place. Despite being classified as having a high hazard potential, the lagoon is assessed to be in fair condition as of its last inspection in September 2019. With a maximum discharge of 210 cubic feet per second and an uncontrolled spillway type, the lagoon plays a crucial role in water resource management in the area.
As a key component of the local irrigation infrastructure, the Simplot Effluent Irrigation Lagoon provides a sustainable water source for agricultural activities in Bannock County, Idaho. With its moderate risk assessment level and emergency action plan in place, this lagoon serves as a critical resource for maintaining water supply stability and supporting the region's agricultural economy.
Year Completed |
1981 |
Dam Length |
3800 |
Dam Height |
38.5 |
River Or Stream |
UNNAMED STREAMS BLACKFOOT RIVER |
Surface Area |
38 |
Hydraulic Height |
34 |
Drainage Area |
0.2 |
Nid Storage |
900 |
Outlet Gates |
Other Controlled |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
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 |
|---|---|---|
Upper Blackrock Campsite
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Lower Blackrock Campsite
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East Blackrock Campsite
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Simplot Effluent Irrigation Lagoon