Brooklyn dam
Brooklyn
Brooklyn, also known as Upper Groveton, is a private-owned hydroelectric dam located in Groveton, New Hampshire. Constructed in 1919, this dam on the Upper Ammonoosuc River serves multiple purposes, including hydroelectric power generation. With a height of 19 feet and a length of 275 feet, Brooklyn has a storage capacity of 240 acre-feet and a maximum discharge of 12,500 cubic feet per second.
Despite its age, Brooklyn has a low hazard potential and a moderate risk assessment rating. The dam is regulated by the New Hampshire Department of Environmental Services Dam Bureau and inspected by the Federal Energy Regulatory Commission. While the condition assessment is not available, the dam has a regular inspection frequency of 3 times a year to ensure its safety and integrity. The dam's spillway type is uncontrolled, with a width of 120 feet, serving as a safety measure in case of excessive water flow.
The dam's location in Coos County, New Hampshire, highlights its importance in water resource management and climate resilience efforts in the region. Brooklyn's role in hydroelectric power generation underscores its significance in sustainable energy production and environmental conservation. As water resource and climate enthusiasts, understanding the operational and regulatory aspects of dams like Brooklyn is essential for promoting responsible water management practices and mitigating potential risks associated with infrastructure like dams.
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 Brooklyn -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Upper Ammonoosuc River Near Groveton | 650 cfs | → |
| Connecticut River At North Stratford | 1,840 cfs | → |
| Connecticut River Near Dalton | 4,210 cfs | → |
| Moose River At Victory | 213 cfs | → |
| Androscoggin River Near Gorham | 3,790 cfs | → |
| East Branch Passumpsic River Near East Haven | 152 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Brooklyn.
Boat launches
- Bridge Street Guildhall
- Nay Pond Boat Launch
- Overlook Road 123, Milan
- Milan
- Martin Meadow Pond Boat Launch
- Vermont Fish And Game Boat Lau Lunenburg
Campgrounds
- Percy Loop Tentsite
- Maidstone State Park
- Unknown Pond Tentsite
- Unknown Pond Campsite
- Rogers Ledge Campsite
- Mt Cabot Cabin
Track Brooklyn 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 Brooklyn
Where does the data for Brooklyn 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 Brooklyn.