Mallard Marsh Dam No 3 dam
Mallard Marsh Dam No 3
Mallard Marsh Dam No 3, located in Cerro Gordo County, Iowa, is a local government-owned structure designed by WALLACE, HOL, KAS&SAHMITT in 1967. This earth dam serves primarily for recreation purposes, with a normal storage capacity of 39 acre-feet and a maximum storage of 129 acre-feet. Situated on the TR-WINNEBAGO RIVER, the dam has a length of 425 feet and a height of 8 feet, with a low hazard potential and a moderate risk assessment rating of 3.
Managed by the Iowa Department of Natural Resources (Iowa DNR), Mallard Marsh Dam No 3 is state-regulated, inspected, and enforced. The dam does not have a spillway and is classified as uncontrolled, with no outlet gates or associated structures. Despite being in a low hazard category, the dam's condition assessment is currently not rated, and there is no available information on emergency action plans or risk management measures. The dam's location in FERTILE, Iowa, offers a surface area of 20 acres and a drainage area of 2.97 square miles, providing valuable recreational opportunities for locals and visitors alike.
Overall, Mallard Marsh Dam No 3 is an important earth dam structure in the St. Paul District, serving as a recreational resource for the community. With its unique design and location on the TR-WINNEBAGO RIVER, the dam plays a crucial role in managing water resources in the area. While the dam's risk assessment is moderate, ongoing monitoring and maintenance by the Iowa DNR ensure the safety and functionality of this vital infrastructure for water resource and climate enthusiasts to explore and appreciate.
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 Mallard Marsh Dam No 3 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Winnebago River At Mason City | 501 cfs | → |
| Iowa River Near Rowan | 364 cfs | → |
| Cedar River Near Austin | 173 cfs | → |
| Cedar River At Charles City | 627 cfs | → |
| Little Cedar River Near Ionia | 159 cfs | → |
| East Fork Des Moines River At Dakota City | 796 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mallard Marsh Dam No 3.
Boat launches
- East Lake Street Ventura
- Main Avenue Clear Lake
- Nelson Street Cerro Gordo County
- Winnebago County
- Finch Avenue Worth County
Track Mallard Marsh Dam No 3 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 Mallard Marsh Dam No 3
Where does the data for Mallard Marsh Dam No 3 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 Mallard Marsh Dam No 3.