Unquomonk Upper Reservoir Dam dam
Unquomonk Upper Reservoir Dam
Located in Williamsburg, Massachusetts, the Unquomonk Upper Reservoir Dam stands as a testament to early 20th-century engineering, having been completed in 1903. This earth dam, with a height of 27 feet and a hydraulic height of 24 feet, serves a primary purpose that falls under the category of "Other." With a maximum storage capacity of 30 acre-feet and a normal storage of 27 acre-feet, the dam helps regulate water flow in the forest watershed, with a drainage area of 0.94 square miles.
Managed by the local government and regulated by the Department of Conservation and Recreation, the Unquomonk Upper Reservoir Dam has a hazard potential classified as "Low" and a condition assessment of "Fair." Despite its age, the dam is regularly inspected every 10 years, with the last assessment taking place in 2009. The risk assessment for the dam is moderate, indicating a need for ongoing monitoring and potential risk management measures to ensure its continued safety and functionality for water resource and climate enthusiasts in the area.
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 Unquomonk Upper Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mill River At Northampton | 41 cfs | → |
| Westfield River At Knightville | 159 cfs | → |
| Middle B Westfield River At Goss Heights | 8 cfs | → |
| South River Near Conway | 21 cfs | → |
| Deerfield River Near West Deerfield | 422 cfs | → |
| West Branch Westfield River At Huntington | 68 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Unquomonk Upper Reservoir Dam.
Boat launches
- Kellogg Hill Road, Hatfield
- Mount Tom Road 900-978, Easthampton
- Old Apremont Way, Westfield
- Water Street 266-334, Springfield
- West Street 121, Springfield
- Highway 8 2301-2357, Becket
Campgrounds
- Dar State Forest
- Koa Weathampton
- Chester - Blanford State Forest
- Westover Arb Military
- Windsor State Forest
- Rocky Point
Paddle runs
- The Massachusetts-Connecticut State Line In Hartland To The Confluence With The Salmon Brook Main Stem
- The Hartland Headwaters To The Confluence With The Salmon Brook Main Stem
- The Confluence Of The East And West Branches To The Confluence With The Farmington River In East Granby
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
- Stamford Town Line To Confluence With City Stream
- The Massachusetts-Connecticut Border To Falls Mountain Road In Canaan, Connecticut
Track Unquomonk Upper Reservoir 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 Unquomonk Upper Reservoir Dam
Where does the data for Unquomonk Upper Reservoir 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 Unquomonk Upper Reservoir Dam.