Grass Lake dam
Grass Lake
Grass Lake in Cass, Minnesota, is a Federal-owned Fish and Wildlife Pond managed by the USDA Forest Service. Built in 1970, this Earth dam stands at 5 feet tall and spans 350 feet in length, with a storage capacity of 135 acre-feet. The lake covers a surface area of 35 acres and serves as a vital habitat for local flora and fauna.
Despite its low hazard potential, Grass Lake has a moderate risk assessment rating, emphasizing the need for ongoing monitoring and risk management measures. While the dam's condition is currently not rated, regular inspections are conducted every 10 years to ensure its structural integrity. The outlet gates, spillway type, and emergency action plan status are not specified, highlighting areas for potential improvement in the future.
Located along the TR-Mississippi River, Grass Lake plays a crucial role in water resource management and conservation efforts in the region. Enthusiasts interested in climate resilience and the protection of aquatic ecosystems will find this picturesque lake a valuable case study in sustainable dam operation and maintenance practices.
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 Grass Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mississippi River Near Bemidji | 237 cfs | → |
| Mississippi River At Grand Rapids | 457 cfs | → |
| Straight River Near Park Rapids | 57 cfs | → |
| Prairie River Near Taconite | 160 cfs | → |
| Crow Wing River At Nimrod | 343 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grass Lake.
Boat launches
- Lake Winnibigoshish (W)
- North Shore Drive Northwest 2483, Cass County
- Migizi Trail Cass County
- Cass County
- Oak Point Road Northwest 12165, Cass County
- Federal Dam Drive Northeast 1115, Cass County
Campgrounds
Fishing spots
Track Grass Lake 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 Grass Lake
Where does the data for Grass Lake 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 Grass Lake.