Mantorville dam
Mantorville
Mantorville is a historic gravity dam located on the Zumbro River in Dodge County, Minnesota. Completed in 1888, the dam serves primarily for recreational purposes, offering a surface area of 2 acres and a drainage area of 147.7 square miles. With a dam height of 12 feet and a length of 565 feet, Mantorville provides a maximum storage capacity of 436 acre-feet and a normal storage of 238 acre-feet.
Managed by the Minnesota Department of Natural Resources, Mantorville is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. The dam has a low hazard potential and is assessed to be in fair condition as of the last inspection in 2017. While the spillway type is uncontrolled, the dam has a moderate risk assessment rating of 3, indicating the need for proactive risk management measures to mitigate potential hazards and ensure the dam's long-term resilience in the face of changing climate conditions.
Water resource and climate enthusiasts will find Mantorville to be a significant landmark in the region, showcasing the intersection of historical engineering with modern-day environmental stewardship. As a key component of the local ecosystem and recreational infrastructure, Mantorville exemplifies the importance of sustainable water management practices in the face of evolving climate challenges. Its maintenance and operation reflect a commitment to ensuring the safety and resilience of water resources for both present and future generations.
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 Mantorville -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Zumbro River At Rochester | 159 cfs | → |
| Straight River Near Faribault | 286 cfs | → |
| Cedar River Near Austin | 173 cfs | → |
| Cannon River At Welch | 713 cfs | → |
| Mississippi River At Red Wing | 19,400 cfs | → |
| Root River Near Pilot Mound | 393 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mantorville.
Boat launches
Campgrounds
- Oxbow Park Campground
- Oronococ City Park
- Camp Grounds
- Rice Lake State Park
- Covered Bridge Park Campground
- Old Campground
Fishing spots
Paddle runs
Track Mantorville 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 Mantorville
Where does the data for Mantorville 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 Mantorville.