Webster dam
Webster
Webster is a privately owned dam located in Madison, Idaho, with a primary purpose of irrigation. Constructed in 1976, this earth dam stands at a height of 22.3 feet and has a hydraulic height of 18.1 feet. It impounds Lyons Creek and the Snake River, providing a storage capacity of 55 acre-feet with a normal storage level of 55 acres. With a surface area of 6 acres and a drainage area of 9.2 square miles, Webster plays a crucial role in supporting agricultural activities in the region.
Despite being classified as having a low hazard potential, Webster is subject to state regulation, inspection, and enforcement by the Idaho Department of Water Resources. The dam's condition was assessed as fair during its last inspection in April 2018, with an inspection frequency of every 5 years. The spillway, with a width of 13 feet, is of the uncontrolled type. The risk assessment for Webster indicates a moderate level of risk (3), emphasizing the importance of ongoing monitoring and maintenance to ensure the safety and reliability of this vital water resource infrastructure.
Overall, Webster serves as a key component of the water management system in the area, contributing to the irrigation needs of the local agricultural community. With its modest size and low hazard potential, the dam presents a manageable level of risk that is regularly assessed and monitored. As climate change continues to impact water resources, maintaining the integrity of structures like Webster will be essential in ensuring sustainable water management practices for 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 Webster -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Dry Bed Nr Ririe Id | 3,520 cfs | → |
| Snake River Nr Heise Id | 13,100 cfs | → |
| Willow Creek Nr Ririe Id | 63 cfs | → |
| South Fork Teton River Nr Rexburg Id | 131 cfs | → |
| Snake River At Lorenzo Id | 6,060 cfs | → |
| Nf Teton River Nr Sugar City Id | 125 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Webster.
Boat launches
- Heise Bridge Boat Access
- Byington Boat Ramp
- Wolf Flats Recreation Area
- Bonneville County
- Lorenzo Boat Access
- East Lincoln Road Bonneville County
Campgrounds
- Aspen Grove Inn
- Twin Bridges Co Park
- Kelly Island Campground
- Table Rock Campground
- Tablerock
- Kelly Island
Fishing spots
- Ashton Reservoir
- Palisades Reservoir
- Last Chance Fisherman Access
- Jenny Lake
- Pritchard Boating Site
- Astoria Boating Site
Track Webster 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 Webster
Where does the data for Webster 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 Low 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 Webster.