Greenville Dam dam
Greenville Dam
The Greenville Dam, also known as the Franklin Street Dam, located in Greenville, Michigan, is a gravity dam built in 1914 on the Flat River. With a height of 14.1 feet and a length of 275 feet, this dam serves primarily for recreation purposes, providing a surface area of 149 acres and a normal storage capacity of 1500 acre-feet. The dam is under state regulation by the Michigan DEGLE, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulatory standards.
This significant dam has a spillway width of 50 feet and a maximum discharge capacity of 4720 cubic feet per second, with a hazard potential rated as significant. Despite its age, the dam's condition assessment in 2014 was deemed satisfactory, and it undergoes inspections every four years to monitor its structural integrity. With a very high risk rating of 1, the Greenville Dam is essential in managing water resources and providing recreational opportunities in the Montcalm County area. Water resource and climate enthusiasts will find this dam a key feature in understanding the local hydrology and environmental dynamics of the region.
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 Greenville Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Fish Creek Near Crystal | 30 cfs | → |
| Grand River At Ionia | 1,990 cfs | → |
| Rogue River Near Rockford | 239 cfs | → |
| Little Muskegon River Near Oak Grove | 244 cfs | → |
| Grand River At Grand Rapids | 4,000 cfs | → |
| Muskegon River Near Croton | 2,260 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Greenville Dam.
Boat launches
- Silk City Nature Trail Belding
- Sutherland Drive Northwest 180, Douglass Township
- Midway Walk 399, Belvidere Township
- Whitefish Lake Boat Ramp
- Ionia Grand River Boat Ramp
- Fred Meijer Grand River Valley Rail-Trail Saranac
Campgrounds
- Camp Greenwood
- Wabasis Lake County Park
- Bertha Brock County Park
- Ionia Equestrian-Rustic
- Ionia State Rec Area
- Bass Beach Campground
Fishing spots
Paddle runs
- Morley Dam In T13n, R10w To Croton Dam Pond In T12n, R11w
- Croton Dam In T12n, R11w To City Of Newaygo In T12n, R12w
- South Branch From Forest Boundary East Of Hesperia At West Section Line Of Sec 22, T14n, R14w To Echo Drive In Sec 6, T13n, R12w
- North Branch From Its Confluence With South Branch In Sec 22, T13n, R16 W To Mclaren Lake In Sec 11, T14n, R15w
Track Greenville 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 Greenville Dam
Where does the data for Greenville 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 Significant 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 Greenville Dam.