DISSOLVED IRON

The measurements shown below were made at USGS station 01209710, located on the Norwalk River near the Perry Avenue bridge. All of the measurements are in micrograms per liter, as Fe. For details about the data, press here.

The highest reading, 220, occurred in 7/81, and the lowest, 6.0, in 8/93. All of the readings above 160 (15 percent of the samples), are shown in red and all that are below 55 (another 11 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 104)
Jan-Mar77.3
Apr-Jun 107
Jul-Sep 105
Oct-Dec 125
1980-84 119
1985-89 103
1990-94 88.6
1995-99 114

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   160    
1981 50     70     220     110    
1982 110     110     81       160  
1983 110       110   91       150  
1984 79       100   210       160  
1985 81       130   59       150  
1986 110       75   75       160  
1987 170       90   52       170  
1988 95       83   63       170  
1989         120           110  
1990 57       97   60       100  
1991 64           60     88 130 110
1992 45   61 77 69 140 75 150 110 120   96
1993   42 61
55
48		 66
78
88
87		 88
64
86
79		 82
88
89
93
66		 78
54
55
30		 44
6.0		 160
160
56
43
50		 56
67
58
110		 76
55		 120
160
1994 53 20
86		 63
82
60		 75
100
150
120		 120
130
150
160
120		 140
140
180
130		 210
160
140
52		 220
140
110
83
160
170		 97 100 100 140
1995 87 79 100 120 120 180 140
170		 120 62 150    
1996 90 62   100   130 130 110 110 130   74
1997   56   71 120 140 130 170 100