Holly Twp 9 dam
Holly Twp 9
Holly Twp 9, located in Murray County, Minnesota, is a privately owned earth dam completed in 2007 for flood risk reduction on Plum Creek. Managed by AREA II MN RIVER BASIN PROJECTS, INC, this dam stands at 40 feet in height with a structural height of 50 feet and a total length of 400 feet. With a storage capacity of 186 acre-feet and a drainage area of 1.6 square miles, Holly Twp 9 plays a crucial role in mitigating potential flooding in the surrounding Walnut Grove area.
Despite its low hazard potential, Holly Twp 9 is subject to regular inspections by the Minnesota Department of Natural Resources, with the last assessment conducted in March 2016 deeming its condition as satisfactory. With a moderate risk assessment level of 3, the dam has not experienced any significant modifications since its completion. While the dam lacks certain features like outlet gates and locks, its uncontrolled spillway type ensures effective water discharge during periods of high flow. Overall, Holly Twp 9 serves as a vital infrastructure piece in the region's water resource management efforts.
As an essential part of the flood risk reduction infrastructure in the St. Paul District, Holly Twp 9 contributes to the overall resilience of the Plum Creek watershed. With its private ownership and state regulation, the dam is a key asset in protecting the local community from potential flooding events. By meeting state permitting, inspection, and enforcement requirements, Holly Twp 9 demonstrates a commitment to maintaining its functionality and ensuring the safety of residents in the surrounding area.
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 Holly Twp 9 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Redwood River Near Marshall | 40 cfs | → |
| Redwood River Near Redwood Falls | 194 cfs | → |
| Minnesota River At Morton | 2,390 cfs | → |
| Yellow Medicine River Near Granite Falls | 153 cfs | → |
| Des Moines River At Jackson | 522 cfs | → |
| Flandreau Cr Above Flandreau Sd | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Holly Twp 9.
Track Holly Twp 9 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 Holly Twp 9
Where does the data for Holly Twp 9 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 Holly Twp 9.