Jefferson Marsh Wrp - North dam
Jefferson Marsh Wrp - North
Jefferson Marsh Wrp - North is a state-owned water resource project located in Jefferson, Wisconsin, completed in 2004 with a primary purpose classified as "Other." This Earth-type dam stands at 8.4 feet in height and spans 14,880 feet in length, with a storage capacity of 622 acre-feet and a controlled spillway width of 45 feet. The project is regulated, permitted, inspected, and enforced by the Wisconsin Department of Natural Resources, ensuring its safety and compliance with state regulations.
Despite being categorized as having a low hazard potential and fair condition assessment, Jefferson Marsh Wrp - North is still considered to have a very high risk by the Risk Assessment category. The last inspection in August 2020 indicated that the project meets guidelines, with an inspection frequency of every 10 years. Emergency Action Plans are in place, although the last revision was in 2016, and no inundation maps have been prepared. Overall, this water resource project provides valuable storage and flood control benefits to the surrounding area while posing minimal risk to the community.
Located within the Rock Island District and under the jurisdiction of the state of Wisconsin, Jefferson Marsh Wrp - North serves as a crucial infrastructure for managing water resources in the region. With its efficient design and operational capabilities, this project stands as a testament to the importance of sustainable water management practices in the face of changing climate patterns and increasing water demands.
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 - North -- 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 - North.
Boat launches
- County Road K Jefferson
- Mechanic Street 101, Fort Atkinson
- Bark River -- Access
- Rome Millpond -- Access
- Rock River -- Johnson Creek Rock River Park Access
- Rock River -- Access At State Hwy 26
Campgrounds
- Sandhill Station
- Jellystone Campground
- Kmsf-Su Shelter 3
- Kmsf-Su Shelter 2
- Ottawa Lake Campground
- Pinewoods Campground
Track Jefferson Marsh Wrp - North 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 - North
Where does the data for Jefferson Marsh Wrp - North 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 - North.