H-1 Pool Dam dam
H-1 Pool Dam
The H-1 Pool Dam in Manistique, Michigan, stands as a vital water resource infrastructure managed by federal authorities. Completed in 1937, this earth dam spans a length of 7260 feet and reaches a height of 8 feet, providing crucial storage of up to 384 acre-feet of water for various purposes. Situated on Grays Creek-Offstream, the dam's controlled spillway with a width of 92 feet ensures efficient water discharge during peak flows, contributing to flood control efforts in the region.
Despite its significance, the H-1 Pool Dam exhibits signs of wear and tear, with a poor condition assessment noted during the last inspection in July 2018. Recognized as having a low hazard potential but a very high risk level, the dam requires attention to ensure its long-term safety and functionality. With the Michigan Department of Environment, Great Lakes, and Energy overseeing state regulatory aspects, ongoing inspections and risk management measures are crucial to safeguarding this critical infrastructure and the surrounding community.
As a key component of water resource management in Schoolcraft County, the H-1 Pool Dam serves as a reminder of the importance of proactive maintenance and risk assessment in maintaining the integrity of our water infrastructure. With its historical significance and essential role in flood control, efforts to address its condition and mitigate risks are essential for ensuring the continued protection of downstream communities and the environment.
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 H-1 Pool Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Manistique River Near Manistique | 2,510 cfs | → |
| Black River Near Garnet | 36 cfs | → |
| Tahquamenon River Near Paradise | 1,420 cfs | → |
| Au Train River At Forest Lake | 137 cfs | → |
| Sturgeon River Near Nahma Junction | 258 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near H-1 Pool Dam.
Boat launches
- Ten Curves Road Germfask
- Zellar Road Germfask Township
- County Road 480 Lakefield Township
- Manistique River Road Germfask Township
- M 28 28598, Mcmillan
- Cook's Bay Access Portage Township
Campgrounds
- Mead Creek State Forest Campground
- Fox River State Forest Campground
- South Manistique Lake State Forest Campground
- East Branch Of Fox River State Forest Campground
- Milakokia Lake State Forest Campground
- Stanley Lake Campsite
Fishing spots
Paddle runs
- Section 17, T48n, R17w (Boundary Of Pictured Rocks National Lakeshore Lands) To Mouth At Lake Superior
- County Road H-58 (Aka. Adams Trail/ Munising-Van Meer-Shingleton Rd.) To Mouth At Lake Superior
- From Sixteen Mile Lake To North Line Of Sec 26, T43n, R19w
- East Branch From Western Forest Boundary (Sec 19, T46n, R6w) To Confluence With Mainstem
- Source In Sec 21, T47n, R12w To Mouth At Whitefish Bay
- Origin At Confluence Of Outlets Of Frenchman Lake And Carp Lake (Sec 26, T44n, R6w) To West Section Line Of Sec 30, T43n, R5w
Track H-1 Pool Dam 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 H-1 Pool Dam
Where does the data for H-1 Pool Dam 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 H-1 Pool Dam.