Drew Lake South Weir dam
Drew Lake South Weir
Drew Lake South Weir is a concrete dam located in Weare, New Hampshire, designed for flood risk reduction along the Choate Brook. The dam stands at a height of 12 feet and spans 385 feet in length, with a storage capacity of 1560 acre-feet. With a low hazard potential and a moderate risk assessment rating, the dam is state-regulated and inspected by the NHDES Dam Bureau to ensure its structural integrity and safety measures are up to standard.
The Drew Lake South Weir is owned by a federal agency and serves as a crucial infrastructure for managing water resources in the Hillsborough County area. The dam's uncontrolled spillway has a width of 210 feet, providing a means for managing excess water flow during periods of heavy rainfall. While the dam's condition assessment is currently not rated, it undergoes inspections every 6 years to assess its overall functionality and safety measures.
With its primary purpose being flood risk reduction, Drew Lake South Weir plays a vital role in protecting the surrounding community from potential water-related disasters. The dam's location, design, and operational features contribute to its effectiveness in managing water levels and minimizing the risk of flooding in the area. As a key component of the water resource management infrastructure in New Hampshire, the dam continues to be a significant asset in mitigating the impact of climate-related events on the local ecosystem and community.
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 Drew Lake South Weir -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Piscataquog River Bl Everett Dam | 8 cfs | → |
| Contoocook R Bl Hopkinton Dam At W Hopkinton | 758 cfs | → |
| Warner River At Davisville | 348 cfs | → |
| Contoocook River Near Henniker | 580 cfs | → |
| South Branch Piscataquog River Near Goffstown | 127 cfs | → |
| Blackwater River Near Webster | 19 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Drew Lake South Weir.
Boat launches
- Drew Lake Boat Launch
- Hopkinton-Everett Reservoir Boat Launch
- Maple Street Hopkinton
- Hopkinton
- Mount William Pond Boat Launch
Campgrounds
- Mile-Away Campground
- Camp Spaulding
- Fox Brook Tent Site
- Saddleback Campground
- Camp Wanocksett
- Mt Monadnock State Park Campground
Track Drew Lake South Weir 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 Drew Lake South Weir
Where does the data for Drew Lake South Weir 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 Drew Lake South Weir.