Tesoro Water Storage Reservoir Dam
Tesoro Water Storage Reservoir
Tesoro Water Storage Reservoir, located in Skagit, Washington, is a privately-owned offstream water storage facility regulated by the Washington Dept of Ecology. Built in 1958, this Earth-type dam stands at a hydraulic height of 11 feet and has a storage capacity of 47 acre-feet, with a normal storage level of 37 acre-feet. The reservoir covers a surface area of 5 acres and serves as a critical source of water supply for the region.
With a high hazard potential and fair condition assessment, the Tesoro Water Storage Reservoir undergoes inspections every 5 years to ensure its structural integrity and safety. The reservoir has a maximum discharge capacity of 163 cubic feet per second and is equipped with spillway mechanisms to manage excess water flow. Although no emergency action plan (EAP) has been prepared or updated recently, the facility meets state permitting and inspection requirements, demonstrating a commitment to maintaining operational standards and regulatory compliance.
Overall, Tesoro Water Storage Reservoir plays a vital role in supporting water supply needs in the Skagit area, with a focus on ensuring the safety and reliability of its infrastructure. As a key component of the regional water management system, the reservoir's continued maintenance and monitoring are essential for safeguarding water resources and mitigating potential risks associated with its operation.
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 Tesoro Water Storage Reservoir -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Skagit River Near Mount Vernon | 10,900 cfs | → |
| Samish River Near Burlington | 28 cfs | → |
| Brannian Creek At S Bay Dr Nr Wickersham | 0 cfs | → |
| Anderson Creek Near Bellingham | 1 cfs | → |
| Olsen Creek Near Bellingham | 0 cfs | → |
| Carpenter Creek At N Shore Drive Nr Bellingham | 0 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tesoro Water Storage Reservoir.
Boat launches
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Campgrounds
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River runs
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About Tesoro Water Storage Reservoir
Where does the data for Tesoro Water Storage Reservoir 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.