Lower Long Lake Dam dam
Lower Long Lake Dam
Lower Long Lake Dam, located in Millville, Michigan, is a state-regulated earth dam completed in 1965 for the primary purpose of recreation. The dam, standing at 11 feet tall with a hydraulic height of 9.3 feet, controls the flow of the Abbott Drain and creates a reservoir with a normal storage capacity of 600 acre-feet. With a surface area of 285 acres and a drainage area of 4.5 square miles, the dam has a low hazard potential and is currently in fair condition according to the last inspection conducted in May 2020.
Despite its low hazard potential, Lower Long Lake Dam poses a very high risk (ranked 1 out of 10) according to risk assessment criteria. The dam has a controlled spillway with a width of 5 feet and a maximum discharge capacity of 100 cubic feet per second. While the dam has not been significantly modified over the years and does not have associated locks or outlet gates, it undergoes regular inspections by the state regulatory agency, Michigan DEGLE, to ensure its structural integrity and safety. The dam's emergency action plan status and risk management measures are currently not reported, indicating potential areas for improvement in emergency preparedness.
Overall, Lower Long Lake Dam serves as a recreational resource for the local community, offering opportunities for boating, fishing, and other water activities. As an earth dam with a modest height and storage capacity, the dam plays a vital role in flood control and water management in the area. With its relatively low hazard potential and fair condition, ongoing monitoring and maintenance efforts are essential to ensure the safety and longevity of the dam for both recreational and environmental purposes in the years to come.
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 Lower Long Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Farmers Creek Near Lapeer | 27 cfs | → |
| South Branch Flint River Near Columbiaville | 162 cfs | → |
| Flint River Near Otisville | 289 cfs | → |
| Kearsley Creek Near Davison | 37 cfs | → |
| Stony Creek Near Romeo | 13 cfs | → |
| East Pond Creek At Romeo | 14 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lower Long Lake Dam.
Boat launches
- Long Lake, 204 Acres, Lapeer County
- Lake Nepessing, 414 Acres, Lapeer County
- Holloway Reservoir, 2000 Acres, Lapeer County
- Minnawanna Lake, Metamora Hadley State Park, Lapeer County
- Big Fish Lake, 105 Acres, Lapeer County
- Sawmill Lake Road Hadley Township
Campgrounds
- Old Family Camp Site - Not Rentable
- Elliott Family Camp - 17 Rv Sites
- Camporee Area
- Paul Bunyon
- Migisi
- Forester
Fishing spots
Track Lower Long Lake 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 Lower Long Lake Dam
Where does the data for Lower Long Lake 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 Lower Long Lake Dam.