804 Reservoir Dam dam
804 Reservoir Dam
Located in Mesa, Washington, the 804 Reservoir Dam is a state-owned structure primarily used for irrigation purposes. Completed in 1979, this earthen dam stands at a hydraulic height of 12 feet and a structural height of 10 feet, with a length of 150 feet. It has a storage capacity of 160 acre-feet and covers a surface area of 10 acres, serving the surrounding area with water for agricultural needs.
Managed by the Washington Department of Ecology, the 804 Reservoir Dam is regulated, permitted, inspected, and enforced by the state. Its hazard potential is rated as low, and its condition assessment is currently not rated. The dam is situated offstream and falls under the jurisdiction of the Walla Walla District of the US Army Corps of Engineers. With a maximum discharge capacity of 50 cubic feet per second, this dam plays a crucial role in water resource management in the region.
Congressional District 04, represented by Dan Newhouse, oversees the 804 Reservoir Dam, ensuring its compliance with state regulations and safety standards. As a key infrastructure for irrigation in Franklin County, this dam underscores the importance of sustainable water resource management in the face of changing climate conditions. With its strategic location and vital role in supporting agricultural activities, the 804 Reservoir Dam stands as a testament to the resilience and adaptability of water infrastructure in the Pacific Northwest.
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 804 Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Yakima River At Kiona | 1,620 cfs | → |
| Walla Walla River Near Touchet | 273 cfs | → |
| Columbia River Below Priest Rapids Dam | 141,000 cfs | → |
| Crab Creek Near Beverly | 224 cfs | → |
| Palouse River At Hooper | 336 cfs | → |
| Crab Creek Near Moses Lake | 51 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near 804 Reservoir Dam.
Boat launches
- Ringold Boat Launch
- Snyder Boat Launch
- Columbia Plateau Trail, Pasco
- Columbia Plateau Trail State Park Franklin County
- Franklin County
Track 804 Reservoir Dam 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 804 Reservoir Dam
Where does the data for 804 Reservoir Dam 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 Low 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 804 Reservoir Dam.