Lower Granite Lock And Dam - North Levee dam
Lower Granite Lock And Dam - North Levee
The Lower Granite Lock and Dam - North Levee, also known as the Lewiston Levees, is a federal structure owned and managed by the US Army Corps of Engineers in Washington state. Completed in 1974, the primary purpose of the dam is navigation, with additional functions including fish and wildlife ponds, hydroelectric power generation, and recreational activities. Situated on the Snake River within the Walla Walla District, the dam is an important part of the region's water resource infrastructure.
Despite its high hazard potential, the dam is regularly inspected and monitored to assess and manage flood risks associated with its operations. The US Army Corps of Engineers prioritizes activities that mitigate risks, engages with local emergency managers, and updates emergency action plans to ensure readiness in case of a dam-related emergency. By working closely with relevant stakeholders and implementing maintenance and repair measures as needed, the USACE aims to ensure the structural integrity and safety of the dam for both navigation and flood control purposes. More detailed information on risk management measures specific to this dam will be added in the future.
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 Lower Granite Lock And Dam - North Levee -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Asotin Creek At Asotin | 86 cfs | → |
| Clearwater River At Spalding Id | 33,300 cfs | → |
| Lapwai Creek Nr Lapwai Id | 33 cfs | → |
| Sweetwater Creek At Mouth At Sweetwater Id | 8 cfs | → |
| Webb Creek Near Sweetwater Id | -999,999 cfs | → |
| Potlatch River Bel Little Potlatch Cr Nr Spalding | 109 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lower Granite Lock And Dam - North Levee.
Boat launches
- Steelhead Park
- Riverside Drive 2213-2249, Clarkston
- 1st Street, Asotin
- Beaver Road Nez Perce County
- Snake River Road Asotin County
- Waha Lake Road Nez Perce County
Campgrounds
- Chief Timothy Campground
- Lime Hill Campsite
- Pataha Campground
- Wild Goose Campsite
- Wenatchee Guard Station
- Boundary Campground
Track Lower Granite Lock And Dam - North Levee 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 Lower Granite Lock And Dam - North Levee
Where does the data for Lower Granite Lock And Dam - North Levee 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 Lower Granite Lock And Dam - North Levee.