Granville Reservoir Dam dam
Granville Reservoir Dam
Granville Reservoir Dam, located in Granville, Massachusetts, serves as a vital water supply source for the region. Built in 1930, this earth dam stands at a height of 85 feet and has a storage capacity of 2400 acre-feet. The dam is primarily regulated by the Department of Conservation and Recreation, with regular inspections ensuring its structural integrity and safety.
The dam overlooks the Hollister Brook and Tillotson Brook, with a surface area of 76.8 acres and a drainage area of 5.2 square miles. Despite its high hazard potential, the condition assessment of the dam was reported as satisfactory during the last inspection in December 2016. Its spillway type is uncontrolled, with a spillway width of 0, and it has a moderate risk assessment rating of 3.
Granville Reservoir Dam plays a crucial role in managing water resources in the area, with its efficient design and construction meeting the water supply needs of the local community. As a significant infrastructure for water management, the dam stands as a testament to the importance of sustainable water resource practices in the face of changing climate conditions.
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 Granville Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Hubbard River Nr. West Hartland | 8 cfs | → |
| Westfield River Near Westfield | 371 cfs | → |
| West Branch Westfield River At Huntington | 61 cfs | → |
| Stony Brook Near West Suffield | 4 cfs | → |
| West Branch Farmington River Near New Boston | 47 cfs | → |
| Middle B Westfield River At Goss Heights | 8 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Granville Reservoir Dam.
Boat launches
- Howells Pond
- Old Apremont Way, Westfield
- Main Road, Tolland
- West Street 121, Springfield
- South End Bridge Agawam
- Rainbow Reservoir
Campgrounds
- Granville State Forest
- Primitve Camping Area
- Roaring Brook Camp Area
- Tolland State Forest
- Chester - Blanford State Forest
- James Stocking Youth Group Camping Area
Fishing spots
- Great Brook Reservoir
- Lower Fulton Park Pond
- Lake Quassapaug
- Seymour Reservoir Number 4
- Reservoir Number 2
- Papermill Pond
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
- New Hartford/Canton Town Line To The Confluence With The Nepaug River
- The Confluence With The Nepaug River To A Point 0.2 Miles Below The Lower Collinsville Dam Tailrace
Track Granville 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 Granville Reservoir Dam
Where does the data for Granville 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 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 Granville Reservoir Dam.