Leoni Dam dam
Leoni Dam
Leoni Dam, located in Jackson, Michigan, is a local government-owned structure on Leoni Creek, completed in 1913 for recreational purposes. The earth dam stands at a height of 9.6 feet with a hydraulic height of 9.7 feet, offering a maximum storage capacity of 130 acre-feet and a normal storage of 42 acre-feet. The dam spans 325 feet in length and covers a surface area of 30 acres, serving as a popular spot for outdoor activities amidst a picturesque setting.
Despite its historical significance and recreational value, Leoni Dam has a poor condition assessment as of its last inspection in July 2015. Classified with a low hazard potential and moderate risk level, the dam is in need of attention to ensure its structural integrity and continued safe operation. While the dam has state regulation, inspection, and enforcement in place, ongoing maintenance and potential risk management measures are essential to address its current condition and ensure the safety of surrounding communities and the environment.
As water resource and climate enthusiasts, it is crucial to monitor the maintenance and risk management efforts for Leoni Dam to preserve its recreational benefits and prevent any potential hazards. With its location in a scenic area and vital role in providing water storage and regulation, stakeholders must prioritize the upkeep and safety of the dam to protect both the local ecosystem and the community's enjoyment of this historic water resource feature.
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 Leoni Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Grand River At Jackson | 85 cfs | → |
| River Raisin Near Manchester | 17 cfs | → |
| Mill Creek Near Dexter | 42 cfs | → |
| Saline River Near Saline | 39 cfs | → |
| Grand River Near Eaton Rapids | 1,400 cfs | → |
| Huron River At Ann Arbor | 332 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Leoni Dam.
Boat launches
- Avenue C Street 300, Vandercook Lake
- Loveland Road Sylvan Township
- Maplegrove Road 1028, Rives Township
- Loveland Road Waterloo Village
- Cedar Lyndon Township
- Cedar Lake Road Sylvan Township
Campgrounds
- Portage Lake - Waterloo State Rec Area
- Horsemen's Equestrian Campground
- Burns Cabins
- Sugarloaf Lake - Waterloo State Rec Area
- Pleasant Lake
- Green Lake - Waterloo State Rec Area
Track Leoni Dam 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 Leoni Dam
Where does the data for Leoni Dam 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 Leoni Dam.