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Mansfield Hollow Dam, Natchaug River
Mansfield Hollow Dam, Natchaug River
 Drainage Area: 159 sq. miles 
 Channel Capacity: 2,900 cfs 
 Storage at Spillway Crest: 5.8 in / 52,000 ac-ft  
 Normal Pool: 16.5 Feet (Summer), 15 Feet (Winter), 18.5 Feet (Spring) 
 Gate Settings for August 08, 2026 08:08 am Gate 1 Gate 2 Gate 3 Gate 4 Gate 5 Gate 6 Gate 7 Gate 8
  0.5 0.0 0.0 0.0 0.0      
Date Time (EDT) Pool
(ft)		 Storage
(%)		 Storage
(ac-ft)		 Tailwater
(ft)		 Flow
(cfs)		 Inflow
(cfs)		 Inflow Test
(cfs)		 Precip
(in)		 Air Temp
(F)
Aug-09 08:30 am 18.12 1.1 3,540 1.79 90 100   33.11 74.8
Aug-09 07:30 am 18.12 1.1 3,540 1.78 89 100 54 33.11 70.6
Aug-09 06:30 am 18.12 1.1 3,540 1.79 90 100 54 33.11 68.7
Aug-09 05:30 am 18.12 1.1 3,540 1.79 90 100 55 33.11 68.8
Aug-09 04:30 am 18.11 1.1 3,535 1.78 89 90 56 33.11 69.5
Aug-09 03:30 am 18.11 1.1 3,535 1.79 90 90 57 33.11 70.0
Aug-09 02:30 am 18.11 1.1 3,535 1.78 89 100 58 33.11 70.3
Aug-09 01:30 am 18.11 1.1 3,535 1.78 89 111 58 33.11 70.3
Aug-09 12:30 am 18.11 1.1 3,535 1.78 89 111 59 33.11 70.8
Aug-08 11:30 pm 18.11 1.1 3,535 1.79 90 111 59 33.11 71.5
Aug-08 10:30 pm 18.11 1.1 3,535 1.78 89 111 59 33.11 72.2
Aug-08 09:30 pm 18.11 1.1 3,535 1.80 92 111 60 33.11 72.5
Aug-08 08:30 pm 18.10 1.1 3,530 1.80 92 100 61 33.09 73.4
Aug-08 07:30 pm 18.09 1.1 3,525 1.79 90 90 61 33.09 74.5
Aug-08 06:30 pm 18.09 1.1 3,525 1.80 92 90 59 32.83 86.2
Aug-08 05:30 pm 18.09 1.1 3,525 1.78 89 90 60 32.83 87.0
Aug-08 04:30 pm 18.09 1.1 3,525 1.77 88 90 60 32.83 90.3
Aug-08 03:30 pm 18.09 1.1 3,525 1.79 90 91 60 32.83 91.9
Aug-08 02:30 pm 18.09 1.1 3,525 1.79 90 91 61 32.83 90.6
Aug-08 01:30 pm 18.09 1.1 3,525 1.79 90 91 61 32.83 90.7
Aug-08 12:30 pm 18.09 1.1 3,525 1.79 90 90 61 32.83 89.2
Aug-08 11:30 am 18.09 1.1 3,525 1.79 90 100 61 32.83 87.5
Aug-08 10:30 am 18.09 1.1 3,525 1.79 90 100 62 32.83 82.9
Aug-08 09:30 am 18.09 1.1 3,525 1.79 90 101 63 32.83 79.4
Aug-08 08:30 am 18.09 1.1 3,525 1.79 90 101 64 32.83 76.8
Maximum 24 Hour Drawdown Rate (5 feet/day): 1,075 cfs + Inflow (100 cfs) = 1,175 cfs
Report Generated August 09, 2026 12:48 pm