Mazomanie dam
Mazomanie
Mazomanie, also known as Lake Marion Outlet, is a local government-owned dam located in Dane County, Wisconsin. Built in 1851, this earthen dam sits on the Black Earth Creek and serves primarily for recreational purposes, offering a surface area of 20 acres and a normal storage capacity of 50 acre-feet. With a dam height of 14 feet and a hydraulic height of 8 feet, Mazomanie has a drainage area of 35.2 square miles and a maximum discharge of 50 cubic feet per second.
Despite its long history, Mazomanie poses a high hazard potential and has been rated as unsatisfactory in terms of its condition assessment. The dam underwent modifications in 1971, and its last inspection was conducted in January 2013. With a very high risk assessment rating, it is crucial for the structure to undergo regular inspections and maintenance to ensure its safety and the protection of downstream areas. The dam is regulated by the Wisconsin Department of Natural Resources and is subject to state permitting, inspection, and enforcement.
Water resource and climate enthusiasts in Mazomanie can appreciate the historical significance and recreational value of this dam while also recognizing the importance of its maintenance and risk management. As a key element in the local water infrastructure, Mazomanie serves as a reminder of the ongoing challenges and responsibilities in managing water resources effectively in the face of changing climate conditions. By staying informed and engaged in the monitoring and maintenance of structures like Mazomanie, enthusiasts can contribute to the sustainable management of water resources for future generations.
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 Mazomanie -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Black Earth Creek At Black Earth | 51 cfs | → |
| Brewery Creek-Upstream Site-At Cross Plains | 2 cfs | → |
| Pheasant Branch At Airport Road Nr Middleton | 2 cfs | → |
| Pheasant Branch At Middleton | 3 cfs | → |
| Spring Creek Near Waunakee | 8 cfs | → |
| Badger Mill Creek At Verona | 11 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mazomanie.
Boat launches
- Wisconsin River -- Mazo Town Boat Landing
- Ferry Crossing Bluff Road Town Of Prairie Du Sac
- River Road Town Of Arena
- Indian Lake County Park Boat Ramp-- Access
- Wisconsin River -- Access At Sauk City Off Hwy 12
- Wisconsin River -- Sauk City - Access Off Water Street
Campgrounds
- Cedar Hills Campground
- Andersen Preserve Dca
- Springfield Hill Dca
- Vfw Campground
- Blue Mound State Park
- Brigham Park
Paddle runs
- Honey Creek (County Road Y On The Southern Bank) To The State Route 130 Highway Bridge Crossing At Lone Rock
- Lone Rock To The Confluence Of The Green And Wisconsin Rivers
- The Big Green River To The River's Mouth At The Mississippi River
More reservoirs
Track Mazomanie 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 Mazomanie
Where does the data for Mazomanie 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 Mazomanie.