Protecting Big Island Pond for future generations requires ongoing effort from the community. The Big Island Pond Corporation and the Friends of Big Island Pond coordinate most of the environmental monitoring and management programs described here.
Water Quality
Big Island Pond participates in the NH Volunteer Lake Assessment Program (VLAP), which tracks long-term water quality trends. Volunteers collect water samples throughout the season that are analyzed for clarity, nutrients, and other indicators.
- Secchi depth (water clarity) is measured regularly — clearer water indicates a healthier ecosystem.
- Phosphorus levels are monitored, as excess nutrients can promote algal growth.
- Historical data is available through the BIPC website.
You can help protect water quality by minimizing fertilizer and pesticide use near the shoreline, maintaining a natural buffer of vegetation along the water's edge, and properly maintaining your septic system.
Invasive Species
Invasive aquatic plants and animals are one of the greatest threats to New Hampshire lakes. Big Island Pond has been actively managing invasive species for many years.
Spiny Naiad (Najas minor)
Spiny naiad is the primary invasive aquatic plant in Big Island Pond. This non-native annual plant can form dense mats that crowd out native vegetation, degrade fish habitat, and impede boating and swimming. The BIPC coordinates herbicide treatment programs to control its spread.
Preventing the Spread
Every boater and swimmer can help prevent the introduction and spread of invasive species by following these simple steps:
- Clean — Remove all visible plants, animals, and mud from your watercraft, trailer, and equipment.
- Drain — Drain all water from your boat, motor, bilge, bait wells, and live wells before leaving the water access area.
- Dry — Allow your boat and equipment to dry completely before using in another water body.
If you see something, say something. Report new aquatic invasive species to the NH Dept. of Environmental Services ›
Fish Population Management
The BIPC works with NH Fish & Game to monitor fish populations and ensure a healthy, balanced fishery. Recent monitoring has included attention to American eel populations, which are a native species of ecological importance in the pond.
Rainbow trout are stocked periodically to enhance fishing opportunities, particularly in early spring when water temperatures are suitable.
Dam & Water Level
The dam at the outlet of Big Island Pond is maintained by the Big Island Pond Corporation. The dam controls the pond's water level, which affects shoreline conditions, fish habitat, and overall pond health. Drawdown reports and dam maintenance updates are posted on the BIPC website.
How You Can Help
Shoreline Buffer
Maintain a natural buffer of native plants along your shore to filter runoff and prevent erosion.
Septic Systems
Have your septic system inspected and pumped regularly to prevent nutrient pollution.
Clean Boats
Clean, drain, and dry your boat and trailer every time you move between water bodies.
Join FBIP
Support the Friends of Big Island Pond to fund conservation and water quality programs.