Jefferson Marsh Wrp - South dam
Jefferson Marsh Wrp - South
The Jefferson Marsh Wrp - South, located in Jefferson, Wisconsin, is a state-regulated water resource project along Deer Creek. Completed in 2004, this earth dam stands at a height of 8.7 feet and has a normal storage capacity of 500 acre-feet. With a low hazard potential and fair condition assessment, it is regularly inspected by the Wisconsin Department of Natural Resources (WIDNR) to ensure its safety and functionality.
Despite its low hazard potential, the Jefferson Marsh Wrp - South is crucial for managing water resources in the area, with a maximum discharge capacity of 604 cubic feet per second. This controlled spillway dam plays a significant role in flood control and water storage, helping to protect the surrounding area from potential risks. With a very high risk assessment rating of 1, it is important to have emergency action plans in place to address any potential issues and ensure the safety of the community.
Managed by the state of Wisconsin, the Jefferson Marsh Wrp - South is a vital infrastructure that contributes to the overall water management efforts in the region. With a focus on water resource management and climate resilience, this project showcases the importance of sustainable infrastructure development to address the challenges posed by changing environmental conditions.
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 Jefferson Marsh Wrp - South -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Bark River Near Rome | 116 cfs | → |
| Rock River At Robert Street At Fort Atkinson | 2,260 cfs | → |
| Crawfish River At Milford | 624 cfs | → |
| Rock River At Watertown | 1,050 cfs | → |
| Bark River At Nagawicka Road At Delafield | 41 cfs | → |
| Mukwonago River At Mukwonago | 45 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Jefferson Marsh Wrp - South.
Boat launches
- County Road K Jefferson
- Mechanic Street 101, Fort Atkinson
- Bark River -- Access
- Rome Millpond -- Access
- Rock River -- Access At State Hwy 26
- Rock River -- Johnson Creek Rock River Park Access
Campgrounds
- Sandhill Station
- Jellystone Campground
- Kmsf-Su Shelter 3
- Kmsf-Su Shelter 2
- Ottawa Lake Campground
- Pinewoods Campground
Fishing spots
Track Jefferson Marsh Wrp - South 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 Jefferson Marsh Wrp - South
Where does the data for Jefferson Marsh Wrp - South 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 Jefferson Marsh Wrp - South.