Conners Marsh Dam dam
Conners Marsh Dam
Conners Marsh Dam, located in Mio, Michigan, is a state-regulated and state-jurisdiction dam built in 1964 for recreational purposes along Connors Marsh Creek. This earth and gravity dam stands at a height of 8 feet with a hydraulic height of 6 feet and a length of 270 feet. It has a storage capacity of 950 acre-feet, with a normal storage of 250 acre-feet and a maximum discharge of 85 cubic feet per second.
Despite being categorized as having a low hazard potential, the dam's condition was assessed as fair during the last inspection in June 2018, with a moderate risk level assigned. The dam is regularly inspected every 5 years to ensure its structural integrity and safety. Conners Marsh Dam is a vital part of the water resource management in Crawford County, Michigan, and plays a crucial role in providing recreational opportunities for the local community. Enthusiasts of water resources and climate will find the engineering and operational details of Conners Marsh Dam fascinating and essential in understanding its role in the region's ecosystem.
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 Conners Marsh Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Branch Au Sable River Near Luzerne | 347 cfs | → |
| Au Sable River Near Red Oak | 1,450 cfs | → |
| Au Sable River At Mio | 1,390 cfs | → |
| Au Sable River Near Mc Kinley | 1,820 cfs | → |
| Au Sable River Near Curtisville | 1,690 cfs | → |
| Pigeon R At Sturgeon Valley Rd Near Vanderbilt | 113 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Conners Marsh Dam.
Boat launches
- Chase Bridge Road 10199, South Branch Township
- Bright Glory Lane Grayling Charter Township
- Legend Drive Otsego Lake Township
- Briggs Road Otsego Lake Township
- Balsam Road 6998, Charlton Township
- Lakeview Street Otsego Lake Township
Campgrounds
- White Pine Canoe Camp
- Wakeley Lake Area
- Parmalee Bridge State Forest Campground
- Kneff Lake Campground
- Luzerne Trail Camp
- Keystone Landing State Forest Campground
Track Conners Marsh 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 Conners Marsh Dam
Where does the data for Conners Marsh 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 Conners Marsh Dam.