Horn School Rest Area Sewage Lagoon dam
Horn School Rest Area Sewage Lagoon
The Horn School Rest Area Sewage Lagoon in Whitman, Washington, is a state-owned facility regulated by the Washington Department of Ecology. 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.
Dam data reference
Condition Assessment
- Satisfactory
- No 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.
- 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.
- 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.
Hazard Potential Classification
- High
- Dams 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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Horn School Rest Area Sewage Lagoon -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Hangman Creek At State Line Road Near Tekoa | 11 cfs | → |
| Palouse River Nr Potlatch Id | 71 cfs | → |
| South Fork Palouse River At Pullman | 19 cfs | → |
| Hangman Creek At Spokane | 72 cfs | → |
| Spokane River At Spokane | 5,740 cfs | → |
| St Joe River Nr Chatcolet Id | 802 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Horn School Rest Area Sewage Lagoon.
Track Horn School Rest Area Sewage Lagoon in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Horn School Rest Area Sewage Lagoon
Where does the data for Horn School Rest Area Sewage Lagoon come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the High hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Horn School Rest Area Sewage Lagoon.