Robert Coyier dam
Robert Coyier
Robert Coyier is a privately owned earth dam located in Mifflin, Wisconsin, along the TR Pecatonica River. Completed in 1974, this dam serves primarily for fire protection and as a stock or small fish pond. With a height of 24 feet and a hydraulic height of 15 feet, it has a storage capacity of 107 acre-feet and a drainage area of 0.2 square miles. The dam has a low hazard potential and is currently in fair condition as of the last assessment in May 2020.
Despite being privately owned, Robert Coyier is regulated by the Wisconsin Department of Natural Resources, which oversees its permitting, inspection, and enforcement. The dam has a moderate risk assessment rating of 3, indicating a level of risk that requires attention but is not immediately threatening. The dam's spillway is uncontrolled, and it has a maximum discharge capacity of 40 cubic feet per second. The last inspection of the dam was conducted in August 2010, with an inspection frequency of every 10 years.
For water resource and climate enthusiasts, Robert Coyier presents an interesting case study of a privately owned dam in rural Wisconsin. Its location along the TR Pecatonica River and its primary purposes of fire protection and stock or small fish pond highlight the diverse roles that dams play in water management. With its fair condition and moderate risk assessment, it serves as a reminder of the importance of regular inspections and maintenance to ensure the safety and reliability of such structures in the face of changing climate conditions.
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 Robert Coyier -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pecatonica River At Darlington | 191 cfs | → |
| Platte River Near Rockville | 182 cfs | → |
| Wisconsin River At Muscoda | 8,530 cfs | → |
| East Br Pecatonica River Near Blanchardville | 153 cfs | → |
| Grant River At Burton | 241 cfs | → |
| Sinsinawa River Near Menominee | 21 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Robert Coyier.
Boat launches
- Town Of Mineral Point
- Lake Joy -- Campground Boat Launch
- Blackhawk Lake -- Access
- Pecatonica River -- Access At Cth G
- Cox Hollow Lake -- Access
- Twin Valley Lake Boat Ramp
Campgrounds
- Blackhawk Lake Rec Area - Highland
- Moundview Park
- Moundsview Park
- Jerome Kohout Private Property Camping
- Governor Dodge State Park Campground
- Governor Dodge State Park
Fishing spots
- Buck Creek
- Little Turkey River
- South Cedar Creek
- Paint Creek
- Fishing Dock Handicapped Accessible
- Little Paint Creek
Paddle runs
- Lone Rock To The Confluence Of The Green And Wisconsin Rivers
- The Big Green River To The River's Mouth At The Mississippi River
- Honey Creek (County Road Y On The Southern Bank) To The State Route 130 Highway Bridge Crossing At Lone Rock
- Western Boundary Of Effigy Mounds National Monument To Boundary Of Effigy Mounds National Monument
More reservoirs
Track Robert Coyier 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 Robert Coyier
Where does the data for Robert Coyier 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 Robert Coyier.