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Technical data on the FRLC projects

Tannery Pond Ashland
Dam type Gravity Dam Gravity Dam
Dam material Laid fieldstones Concrete capped granite blocks
Dam length 125ft 80ft
Dam height 6ft 12ft
Spillway type Overflow weir w/flashboards Overflow weir w/flashboards
Year constructed 1913 1925
Impoundment surface area 8 acres 12 acres
River Millers Squam
Drainage area 49 square miles 67 square miles
Average flow 92 cfs 88 cfs
Average annual minimum flow 4 cfs 15cfs
Bypass reach length 760ft 320ft
Minimum bypass flow 21 cfs 32 cfs
Installed capacity 189kW 84kW
Turbine type Unit 1 – 38” Todney Hunt Type 80, Unit 2 – 48” Leroy Somners Semi-Kaplan Unit 1 – 36” Leroy Somners Semi-Kaplan
Generator type Unit 1 – 1800 rpm induction generator, Unit 2 – 900rpm induction generator Unit 1 – 1800 rpm induction generator
Hydraulic capacity 230cfs 79cfs
Average annual generation 510,000kWh/yr 420,000kWh/yr
Regulatory status FERC exemption from licensing FERC exemption from licensing