Judy Reservoir Dam A dam
Judy Reservoir Dam A
Judy Reservoir Dam A, located in Skagit, Washington, is a vital structure owned by a public utility with a primary purpose of water supply. This earth dam, designed by URS Grenier Woodward-Clyde, stands at a hydraulic height of 61 feet and a structural height of 45 feet, completed in 1946. With a storage capacity of 5100 acre-feet and a normal storage of 4420 acre-feet, the dam plays a crucial role in supplying water to the surrounding areas.
Situated on the Tr-Skagit River, Judy Reservoir Dam A covers a surface area of 140 acres and has a drainage area of 1.5 square miles. Despite its satisfactory condition assessment, the dam is classified as having a high hazard potential, emphasizing the importance of regular inspections and maintenance. The last inspection conducted in January 2019 revealed no immediate concerns, with an inspection frequency of every 5 years to ensure the safety and stability of the structure.
With its significant contribution to water supply and the potential risks associated with its high hazard classification, Judy Reservoir Dam A stands as a critical infrastructure in the region. As water resource and climate enthusiasts, understanding and monitoring the condition of such dams is essential to ensure the resilience and sustainability of water systems in the face of changing climate patterns and environmental challenges.
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 Judy Reservoir Dam A -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Skagit River Near Mount Vernon | 13,300 cfs | → |
| Samish River Near Burlington | 88 cfs | → |
| Skookum Creek Above Diversion Near Wickersham | 79 cfs | → |
| Brannian Creek At S Bay Dr Nr Wickersham | 1 cfs | → |
| Sf Nooksack River At Saxon Bridge | 617 cfs | → |
| Anderson Creek Near Bellingham | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Judy Reservoir Dam A.
Boat launches
- West Big Lake Boulevard 18421, Mount Vernon
- Calhoun Road 1560, Mount Vernon
- Water Street 100, Hamilton
- Chuckanut Drive 3098, Skagit County
- State Route 20 899, Skagit County
- South Lake Ketchum Road Lake Ketchum
Campgrounds
Paddle runs
- Bell Creek To Mt. Baker-Snoqualmie Nf Boundary
- Canyon Creek To Confluence With North Fork Stillaguamish River
- Headwaters To Confluence With Bell Creek
- Headwaters In Ne1/4 Of Sec 23, T37n, R7e To Confluence With Soufh Fork Nooksack River
- Boulder River Wilderness Boundary To Confluence With Stillaguamish River
- Headwaters In Sw1/4 Of Sec 7, T31n, R9e To Boulder River Wilderness Boundary
Track Judy Reservoir Dam A 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 Judy Reservoir Dam A
Where does the data for Judy Reservoir Dam A 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 Judy Reservoir Dam A.