Twin Lakes dam
Twin Lakes
Twin Lakes, located in Rathdrum, Idaho, is a concrete dam constructed in 2005 primarily for flood risk reduction along Twin Lakes and Rathdrum Creek. With a height of 14.3 feet and a hydraulic height of 12 feet, the dam serves as a vital structure in mitigating potential flooding in the area. The dam has a storage capacity of 9090 acre-feet and covers a surface area of 959 acres, with a drainage area of 51 square miles.
Managed by the Idaho Department of Water Resources, Twin Lakes dam is regulated, permitted, inspected, and enforced by the state to ensure its integrity and safety. The dam is equipped with controlled spillways and has a significant hazard potential rating. Despite being in fair condition as of the last assessment in 2017, the dam's risk assessment categorizes it as very high (1), emphasizing the importance of ongoing monitoring and maintenance to address potential risks and ensure the safety of the surrounding communities.
In the event of an emergency, the dam's Emergency Action Plan (EAP) status and preparedness are not specified in the data. However, with its strategic location and critical role in flood risk reduction, Twin Lakes dam stands as a crucial infrastructure ensuring water resource management and climate resilience in the region.
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 Twin Lakes -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Spokane River Blw Blackwell Nr Coeur D Alene Id | 9,040 cfs | → |
| Spokane River Nr Post Falls Id | 9,300 cfs | → |
| Little Spokane River At Elk | 48 cfs | → |
| Pend Oreille River At Newport Wa | 52,900 cfs | → |
| Priest River Nr Priest River Id | 3,390 cfs | → |
| Little Spokane River At Dartford | 198 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Twin Lakes.
Boat launches
- West Twin Lakes Road 9832, Kootenai County
- North Nautical Loop 30475, Kootenai County
- Sportsman Park
- Northeast Newman Lake Drive 12801, Newman Lake
- Blackwell Island Recreation Site
- Spokane River Centennial Trail Spokane County
Campgrounds
- Mokins Bay Campground
- Mokins Bay
- Mount Spokane State Park
- Waldron Campground
- Hill Camground
- Snowberry Campground
Paddle runs
- Cataldo Mission To Coeur D'Alene Lake
- Coeur D"Alene River, Sec. 8, T49n, R2e To Honey Mountain, Sec. 32, T53n, R1w
- Confluence North Fork Coeur D'Alene River To Cataldo Mission
- Forest Boundary, Sec. 34, T59n, R2w To Harrison Lake, Sec. 31, T62n, R2w
- Boundary Proposed Addition Cabinet Mtns Wilderness, Sec. To Cabinet Gorge Reservoir
- Cabinet Mtns Wilderness Boundary, Sec. 3, T27n, R32w To Bull River, Sec. 12, T27n, R33w
Track Twin Lakes 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 Twin Lakes
Where does the data for Twin Lakes 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 Significant 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 Twin Lakes.