Lake Cohasset Dam dam
Lake Cohasset Dam
Lake Cohasset Dam, located in Mahoning, Ohio, was completed in 1897 and serves as a vital recreation spot for water resource and climate enthusiasts. The dam, with a height of 25 feet and a length of 190 feet, provides a storage capacity of 373 acre-feet and covers a surface area of 28 acres. The dam is situated on Mill Creek and falls under the regulatory jurisdiction of the Department of Natural Resources in Ohio.
Despite its historical significance and recreational value, Lake Cohasset Dam has been assessed as being in poor condition with a significant hazard potential. The last inspection in 2016 revealed the dam's deteriorating state, prompting concerns about its structural integrity and safety. The dam has not undergone any modifications in recent years, highlighting the need for immediate attention and potential risk management measures to ensure public safety and environmental protection.
With the dam showing signs of wear and a poor condition assessment, stakeholders and authorities, including Congressman Tim Ryan, must collaborate to address the dam's maintenance and safety concerns. Given its importance for recreation and water resource management, proactive measures such as regular inspections, maintenance, and potential rehabilitation efforts are crucial to safeguarding Lake Cohasset Dam and its surrounding environment for future generations of water resource and climate enthusiasts.
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 Lake Cohasset Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mahoning River Below West Ave At Youngstown Oh | 1,630 cfs | → |
| Mahoning River At Lowellville Oh | 1,770 cfs | → |
| Mahoning River At Leavittsburg Oh | 946 cfs | → |
| Mahoning River At Pricetown Oh | 626 cfs | → |
| Mosquito Creek Bl Mosquito Ck Dam Nr Cortland Oh | 191 cfs | → |
| Shenango River At Sharpsville | 480 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Cohasset Dam.
Boat launches
- Bessemer Lake
- Pa 208;Pa 551 Pulaski
- West Middlesex Access
- Lake Milton State Park Ramp
- Lake Milton State Park - Robinson Point Ramp
- Berlin Lake Boat Ramp
Campgrounds
- Mill Creek - Berlin Reservoir
- Mosquito Lake State Park
- Shenango
- Guilford Lake State Park
- West Branch State Park
- Beaver Creek State Park
Paddle runs
Track Lake Cohasset 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 Lake Cohasset Dam
Where does the data for Lake Cohasset 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 Significant 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 Lake Cohasset Dam.