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Hopkinton Dam, Contoocook River
Hopkinton Dam, Contoocook River
 Drainage Area: 426 sq. miles 
 Channel Capacity: 7,000 cfs 
 Storage at Spillway Crest: 6.5 in / 70,100 ac-ft  
 Normal Pool: 380 Feet NGVD(Summer), 382 Feet NGVD(Winter) 
 Gate Settings for September 11, 2026 07:35 am Gate 1 Gate 2 Gate 3 Gate 4 Gate 5 Gate 6 Gate 7 Gate 8
  0.0 0.0 0.0 0.0 8.0 8.0    
Date Time
(Eastern)		 Pool
(ft)		 Storage
(%)		 Storage
(ac-ft)		 Tailwater
(ft)		 Flow
(cfs)		 Inflow
(cfs)		 Precip
(in)		 Air Temp
(F)
Sep-13 04:45 pm 380.36 0.1 108       38.99  
Sep-13 03:45 pm 380.35 0.1 105 1.62 119 124 38.98 69.3
Sep-13 02:45 pm 380.34 0.1 102 1.61 116 121 38.92 68.4
Sep-13 01:45 pm 380.32 0.1 96 1.58 107 106 38.59 68.4
Sep-13 12:45 pm 380.32 0.1 96 1.56 102 105 38.32 68.4
Sep-13 11:45 am 380.32 0.1 96 1.55 99 105 38.28 68.0
Sep-13 10:45 am 380.32 0.1 96 1.55 99 105 38.28 67.1
Sep-13 09:45 am 380.32 0.1 96 1.55 99 104   66.2
Sep-13 08:45 am 380.31 0.1 93 1.55 99 96 38.27 64.4
Sep-13 07:45 am 380.31 0.1 93 1.55 99 95 38.27 63.9
Sep-13 06:45 am 380.31 0.1 93 1.56 102 94 38.25 63.5
Sep-13 05:45 am 380.31 0.1 93 1.55 99 92 38.19 63.5
Sep-13 04:45 am 380.31 0.1 93 1.52 92 91 37.90 63.5
Sep-13 03:45 am 380.31 0.1 93 1.52 92 91 37.85 63.0
Sep-13 02:45 am 380.31 0.1 93 1.52 92 91 37.85 62.6
Sep-13 01:45 am 380.31 0.1 93 1.53 94 91 37.82 62.6
Sep-13 12:45 am 380.31 0.1 93 1.51 89 91 37.70 63.0
Sep-12 11:45 pm 380.31 0.1 93 1.52 92 86 37.70 63.5
Sep-12 10:45 pm 380.31 0.1 93 1.52 92 86 37.70 65.7
Sep-12 09:45 pm 380.31 0.1 93 1.52 92 87 37.70 68.4
Sep-12 08:45 pm 380.31 0.1 93 1.52 92 87 37.70 72.5
Sep-12 07:45 pm 380.31 0.1 93 1.52 92 82 37.70 78.3
Sep-12 06:45 pm 380.31 0.1 93 1.52 92 88 37.70 85.1
Sep-12 05:45 pm 380.32 0.1 96 1.53 94 94 37.70 90.0
Sep-12 04:45 pm 380.32 0.1 96 1.53 94 94 37.70 89.1
Maximum 24 Hour Drawdown Rate (10 feet/day): 54 cfs + Inflow (124 cfs) = 179 cfs
Report Generated September 13, 2026 09:02 pm