Upper Post Lake dam
Upper Post Lake
Upper Post Lake, located in Langlade County, Wisconsin, is a private reservoir primarily used for recreational purposes. The dam, completed in 1932, is a gravity type structure with a height of 10 feet and a length of 200 feet, creating a storage capacity of 13,000 acre-feet and a surface area of 1,134 acres. The reservoir is fed by the Wolf River and has a maximum discharge of 1,820 cubic feet per second.
Despite being classified as having a low hazard potential, Upper Post Lake faces a very high risk assessment due to its condition assessment being rated as fair. The last inspection in May 2020 revealed the need for potential maintenance or rehabilitation. The emergency action plan (EAP) for the dam was last revised in March 2021, emphasizing the importance of preparedness in case of any unforeseen events. Overall, Upper Post Lake serves as a vital resource for the community, offering both recreational opportunities and a source of water storage in the region.
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 Upper Post Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Wolf River At Langlade | 419 cfs | → |
| Prairie River Near Merrill | 190 cfs | → |
| Wisconsin River At Merrill | 3,620 cfs | → |
| Wisconsin River @ Rainbow Lake Nr Lake Tomahawk | 967 cfs | → |
| Popple River Near Fence | 136 cfs | → |
| Muskellunge Creek Near St. Germain | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Upper Post Lake.
Boat launches
- Arbutus Lake -- Access
- Lily Lake -- Access At Sw Side Of Lake Off Lily Lake Ln
- Jungle Lake Road 8086, Town Of Nashville
- Lake Lucerne Boat Launch
- Roberts Lake -- Access
- Little Long Lake - South Shore Dr
Campgrounds
- Jack Pine
- Langlade County Veterans Memorial Park
- Crockett Campsite
- Whitney Campsite
- Camp Ma-Ka-Ja-Wan
- Game Lake Primitive
Paddle runs
- Unnamed Creek To Forest Boundary In Sec 14, T37n, R13e
- North Branch (Sections 19/30 Line) To Unnamed Creek In Sec 4, T37n, R13e
- Railroad Bridge To 1/4 Mile Downstream From The Ccc Bridge
- Main Branch-Forest Boundary In Sec 18, T37n, R15e To Railroad Bridge
- North Branch--Origin In Sec 10, T38n, R13e To 1/4 Mile West Of Highway 55
- 1/4 Mile Downstream From Ccc Bridge To 1/4 Mile Upstream From Evans Bridge
More reservoirs
Track Upper Post 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 Upper Post Lake
Where does the data for Upper Post 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 Upper Post Lake.