Onota Lake Dam dam
Onota Lake Dam
Located in Pittsfield, Massachusetts, the Onota Lake Dam stands as a vital structure for flood risk reduction along the Pecks/Onota Brook. Constructed in 1995, this concrete gravity dam stands at a height of 18 feet and has a hydraulic height of 11.4 feet, providing a maximum storage capacity of 6,800 acre-feet. With a primary purpose of flood risk reduction, the dam also serves recreational purposes, offering a surface area of 660 acres for outdoor enthusiasts to enjoy.
Managed by the Department of Conservation and Recreation, the Onota Lake Dam is state-regulated and undergoes regular inspections to ensure its structural integrity. With a hazard potential deemed as high, the dam is currently in satisfactory condition, as assessed in June 2016. Its emergency action plan is up-to-date, meeting guidelines to effectively manage any potential risks associated with the structure. As a focal point in the Berkshire County landscape, the dam plays a pivotal role in protecting the local community from potential flooding events, while also providing a scenic backdrop for recreational activities.
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 Onota Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| East Branch Housatonic River At Coltsville | 36 cfs | → |
| Hoosic River At Adams | 52 cfs | → |
| Hoosic River Near Williamstown | 142 cfs | → |
| Green River At Williamstown | 58 cfs | → |
| Valatie Kill Near Nassau Ny | 3 cfs | → |
| Housatonic River Near Great Barrington | 234 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Onota Lake Dam.
Boat launches
- Lakeway Drive 309-399, Pittsfield
- Hancock Road 48-94, Pittsfield
- Beech Road, Richmond
- New Lenox Road 350, Lenox
- Laurel Street 515, Lee
- Ashton Avenue North Adams
Campgrounds
- Sites 11, 12, 13
- Pittsfield State Forest
- Crystal Mountain Campsite (& Privy)
- October Mountain State Forest
- Mt. Greylock State Reservation
- Ash Group Site
Track Onota Lake 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 Onota Lake Dam
Where does the data for Onota Lake 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 High 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 Onota Lake Dam.