Mccoy dam
Mccoy
Mccoy is a private dam in Iowa, Wisconsin, designed by the USDA NRCS and regulated by the WIDNR. Completed in 1974, this earth dam serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 19 feet and a length of 335 feet, Mccoy has a storage capacity of 60 acre-feet and a normal storage capacity of 21.5 acre-feet. The dam has a low hazard potential and is considered to be in fair condition as of the last assessment in March 2021.
Situated on the TR Blue Mounds Branch, Mccoy has a drainage area of 0.5 square miles and a surface area of 5 acres. The dam has a maximum discharge capacity of 60 cubic feet per second and an uncontrolled spillway type. While the risk assessment for Mccoy is moderate, the dam meets inspection and enforcement standards set by the state regulatory agency. With its strategic location in Blanchardville and contribution to water resource management, Mccoy stands as a valuable asset for the community and the environment.
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 Mccoy -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| East Br Pecatonica River Near Blanchardville | 219 cfs | → |
| Pecatonica River At Darlington | 340 cfs | → |
| Badger Mill Creek At Verona | 10 cfs | → |
| Black Earth Creek At Black Earth | 59 cfs | → |
| Brewery Creek-Upstream Site-At Cross Plains | 3 cfs | → |
| Pecatonica River At Martintown | 901 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mccoy.
Boat launches
- Pecatonica River -- Blanchardville -- Boat Access Off Hwy H
- Pecatonica River -- Thunder Bridge Landing - Argyle
- Yellowstone Lake -- Access At East Nr Boat Rental
- Yellowstone Lake -- Access Near Beach
- Yellowstone Lake -- Access Along Lake Rd
- Yellowstone Lake -- Access At West Nr Waterfowl Area
Campgrounds
- Mckellar Park Campground
- Brigham Park
- Blue Mound State Park
- New Glarus Woods State Park Campground
- Blackhawk Memoreial Park Campground
- Twin Valley Campground
Paddle runs
- Honey Creek (County Road Y On The Southern Bank) To The State Route 130 Highway Bridge Crossing At Lone Rock
- Lone Rock To The Confluence Of The Green And Wisconsin Rivers
- The Big Green River To The River's Mouth At The Mississippi River
More reservoirs
Track Mccoy 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 Mccoy
Where does the data for Mccoy 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 Mccoy.