DISSOLVED MANGANESE

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 Mn. For details about the data, press here.

The highest reading, 150, occurred in 7/88, and the lowest, <1.0, in 8/93. All of the readings above 60 (11 percent of the samples), are shown in red and all that are below 16 (another 11 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 35.1)
Jan-Mar31.4
Apr-Jun 36.5
Jul-Sep 44.6
Oct-Dec 26.6
1980-84 37.6
1985-89 42.9
1990-94 25.7
1995-99 31.6

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   50    
1981 60     50     60     41    
1982 43     45     120       41  
1983 23       31   40       22  
1984 36       28   23       22  
1985 42       47   63       23  
1986 36       81   70       19  
1987 45       47   69       20  
1988 41       44   150       60  
1989         23           24  
1990 44       23   28       15  
1991 25           24     16 66 17
1992 19   28 20 24 22 20 27 21 20   26
1993   31 31
31
15		 23
22
27
21		 24
29
28
44		 39
37
50
64
35		 37
39
27
2.0		 25
<1.0		 87
92
19
2.0
33		 23
4.0
33
39		 19
20		 23
47
1994 28 <1.0
29		 21
22
15		 23
28
97
25		 36
29
16
21
24		 34
18
37
28		 42
48
39
2.0		 26
21
27
28
23
24		 33 22 16 15
1995 17 31 22 25 31 85 38
38		 33 38 22    
1996 39 29   24   41 85 27 22 14   15
1997   23   17 23 57 39 48
48		 14
40