Summary
Completed in 1996, this offstream lagoon serves a primary purpose of waste management and has a hydraulic height of 19 feet and a structural height of 9 feet. With a maximum storage capacity of 22 acre-feet and a normal storage level of 19.2 acre-feet, this facility plays a crucial role in managing wastewater and protecting local water resources.
Located in Congressional District 05, Washington, this Earth-type dam covers a surface area of 2.6 acres and has a drainage area of 0. The lagoon has a high hazard potential but is currently assessed as satisfactory in condition. Regular inspections are conducted, with the latest one taking place on September 2, 2021. The facility has a maximum discharge capacity of 10 cubic feet per second and is equipped with emergency action preparedness measures to mitigate risks and ensure environmental safety.
Water resource and climate enthusiasts will appreciate the role of the Horn School Rest Area Sewage Lagoon in wastewater management in the region. With its high hazard potential and satisfactory condition assessment, this state-regulated facility demonstrates a commitment to protecting water quality and environmental integrity. Regular inspections and emergency preparedness measures ensure that the lagoon operates effectively and safeguards the surrounding ecosystem.
Year Completed |
1996 |
Dam Length |
1200 |
River Or Stream |
Offstream |
Primary Dam Type |
Earth |
Surface Area |
2.6 |
Hydraulic Height |
19 |
Nid Storage |
22 |
Structural Height |
9 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Hangman Creek At State Line Road Near Tekoa
|
37cfs |
Palouse River Nr Potlatch Id
|
181cfs |
South Fork Palouse River At Pullman
|
19cfs |
Hangman Creek At Spokane
|
97cfs |
Spokane River At Spokane
|
18600cfs |
St Joe River Nr Chatcolet Id
|
802cfs |
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.
Horn School Rest Area Sewage Lagoon