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 May 20, 2025 07:00 am Gate 1 Gate 2 Gate 3 Gate 4 Gate 5 Gate 6 Gate 7 Gate 8
  1.5 1.5 1.5 1.5 8.0 8.0    
Date Time
(Eastern)
Pool
(ft)
Storage
(%)
Storage
(ac-ft)
Tailwater
(ft)
Flow
(cfs)
Inflow
(cfs)
Precip
(in)
Air Temp
(F)
May-20 07:15 pm 381.70 0.8 552       30.72  
May-20 06:15 pm 381.82 0.8 595 3.91 1,611 1,234 30.72 63.5
May-20 05:15 pm 381.96 0.9 646 3.95 1,636 1,328 30.72 65.3
May-20 04:15 pm 382.07 0.9 690 3.97 1,649 1,407 30.72 66.6
May-20 03:15 pm 382.16 1.0 729 3.98 1,655 1,473 30.72 67.5
May-20 02:15 pm 382.23 1.1 759 3.99 1,662 1,529 30.72 67.1
May-20 01:15 pm 382.29 1.1 785 4.00 1,668 1,583 30.72 68.0
May-20 12:15 pm 382.33 1.1 802 4.01 1,675 1,611 30.72 67.5
May-20 11:15 am 382.35 1.1 811 4.01 1,675 1,631 30.72 64.4
May-20 10:15 am 382.37 1.2 819 4.03 1,687 1,641 30.72 60.3
May-20 09:15 am 382.39 1.2 828 4.02 1,681 1,633 30.72 58.1
May-20 08:15 am 382.40 1.2 832 4.02 1,681 1,618 30.72 50.4
May-20 07:15 am 382.40 1.2 832 4.03 1,687 1,569 30.72 48.6
May-20 06:15 am 382.41 1.2 836 4.03 1,687 1,547 30.72 47.7
May-20 05:15 am 382.41 1.2 836 4.04 1,694 1,508 30.72 48.2
May-20 04:15 am 382.42 1.2 841 4.03 1,687 1,471 30.72 48.6
May-20 03:15 am 382.45 1.2 854 4.03 1,687 1,461 30.72 48.6
May-20 02:15 am 382.48 1.2 866 4.05 1,700 1,460 30.72 49.1
May-20 01:15 am 382.54 1.3 892 4.05 1,700 1,493 30.72 49.1
May-20 12:15 am 382.58 1.3 909 4.07 1,713 1,501 30.72 49.1
May-19 11:15 pm 382.63 1.3 931 4.08 1,719 1,516 30.72 49.1
May-19 10:15 pm 382.69 1.4 957 4.10 1,732 1,557 30.72 49.1
May-19 09:15 pm 382.74 1.4 978 4.10 1,732 1,596 30.72 50.0
May-19 08:15 pm 382.78 1.4 995 4.11 1,739 1,627 30.69 52.2
May-19 07:15 pm 382.81 1.5 1,008 4.13 1,752 1,640 30.66 54.9
Maximum 24 Hour Drawdown Rate (10 feet/day): 278 cfs + Inflow (1,234 cfs) = 1,513 cfs
Report Generated May 20, 2025 11:21 pm