Cadman Lewisville S&G Pit Dam
Cadman Lewisville S&G Pit
Cadman Lewisville S&G Pit is a privately owned structure located in Clark County, Washington, with a primary purpose classified as "Other." This Earth-type dam was completed in 2007 and stands at a hydraulic height of 39 feet with a length of 1400 feet. The dam has a storage capacity of 293 acre-feet, with a normal storage level of 266 acre-feet and a drainage area of 13.75 square miles. The structure is state-regulated by the Washington Dept of Ecology, with inspection, permitting, and enforcement measures in place to ensure its safety and compliance.
Despite being designated as having a high hazard potential, Cadman Lewisville S&G Pit has been assessed to be in satisfactory condition as of March 2021. The dam has a scheduled inspection frequency of 5 years, with the last inspection date recorded in February 2020. Emergency action plans are in place, although it is unclear if they meet guidelines or if inundation maps have been prepared. The structure is not under the jurisdiction of the US Army Corps of Engineers, and there is limited information available on risk assessment, management measures, and other regulatory aspects. Overall, Cadman Lewisville S&G Pit presents an intriguing case study for water resource and climate enthusiasts interested in the management and safety of privately owned dams in the Pacific Northwest.
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 Cadman Lewisville S&G Pit -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| East Fork Lewis River Near Heisson | 81 cfs | → |
| Lewis River At Ariel | 1,750 cfs | → |
| Burnt Bridge Creek Near Mouth At Vancouver | 37 cfs | → |
| Canyon Creek Near Amboy | 44 cfs | → |
| Columbia Slough At Portland | 814 cfs | → |
| Speelyai Creek Near Cougar | 7 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Cadman Lewisville S&G Pit.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Cadman Lewisville S&G Pit
Where does the data for Cadman Lewisville S&G Pit 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 below 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.
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.