Table 6. Annual and monthly suspended-sediment load for the Gresham and Milwaukie gaging stations, Johnson Creek basin, Oregon, water years 2007–10.
[Station reference: Complete station names are shown in table 1 and locations are shown in figure 1. SSL (suspended-sediment load, in tons): All values rounded to 3 significant figures, which results in the percentage of annual total values not computing precisely]
| Month |
Water year |
| 2007 |
2008 |
2009 |
2010 |
Average (2007–10) |
| SSL |
Percentage of annual total |
SSL |
Percentage of annual total |
SSL |
Percentage of annual total |
SSL |
Percentage of annual total |
SSL |
Percentage of annual total |
| Gresham |
| October |
2.50 |
0.1 |
96.8 |
4.6 |
1.01 |
0.0 |
11.4 |
1.1 |
27.9 |
1.5 |
| November |
713 |
30.4 |
194 |
9.1 |
183 |
8.8 |
105 |
10.4 |
299 |
15.8 |
| December |
683 |
29.1 |
1,030 |
48.7 |
346 |
16.6 |
125 |
12.3 |
547 |
28.9 |
| January |
456 |
19.4 |
349 |
16.4 |
1,140 |
54.5 |
163 |
16.1 |
526 |
27.8 |
| February |
216 |
9.2 |
224 |
10.5 |
97.4 |
4.7 |
57.6 |
5.7 |
149 |
7.9 |
| March |
239 |
10.2 |
170 |
8.0 |
158 |
7.6 |
298 |
29.4 |
216 |
11.4 |
| April |
22.7 |
1.0 |
40.2 |
1.9 |
55.6 |
2.7 |
74.2 |
7.3 |
48.2 |
2.5 |
| May |
3.94 |
0.2 |
6.92 |
0.3 |
93.1 |
4.5 |
23.5 |
2.3 |
31.8 |
1.7 |
| June |
2.00 |
0.1 |
8.08 |
0.4 |
9.00 |
0.4 |
154 |
15.2 |
43.4 |
2.3 |
| July |
0.399 |
0.0 |
0.342 |
0.0 |
0.769 |
0.0 |
0.195 |
0.0 |
0.426 |
0.0 |
| August |
0.289 |
0.0 |
0.682 |
0.0 |
1.50 |
0.1 |
0.116 |
0.0 |
0.647 |
0.0 |
| September |
7.54 |
0.3 |
0.180 |
0.0 |
3.53 |
0.2 |
0.679 |
0.1 |
2.98 |
0.2 |
| Total |
2,350 |
100.0 |
2,120 |
100.0 |
2,090 |
100.0 |
1,010 |
100.0 |
1,890 |
100.0 |
| Milwaukie |
| October |
18.7 |
0.3 |
239 |
4.2 |
12.3 |
0.3 |
31.9 |
1.1 |
75.5 |
1.6 |
| November |
1,740 |
31.3 |
432 |
7.6 |
346 |
7.8 |
216 |
7.6 |
683 |
14.7 |
| December |
1,660 |
29.8 |
3,100 |
54.4 |
800 |
18.0 |
364 |
12.7 |
1,480 |
31.9 |
| January |
922 |
16.6 |
814 |
14.3 |
2,490 |
56.2 |
563 |
19.7 |
1,200 |
25.8 |
| February |
497 |
9.0 |
613 |
10.8 |
185 |
4.2 |
136 |
4.7 |
358 |
7.7 |
| March |
589 |
10.6 |
353 |
6.2 |
287 |
6.5 |
855 |
29.9 |
521 |
11.2 |
| April |
53.2 |
1.0 |
88.7 |
1.6 |
95.2 |
2.1 |
162 |
5.7 |
99.8 |
2.2 |
| May |
13.3 |
0.2 |
19.5 |
0.3 |
163 |
3.7 |
90.9 |
3.2 |
71.7 |
1.5 |
| June |
20.6 |
0.4 |
25.6 |
0.4 |
27.8 |
0.6 |
424 |
14.8 |
125 |
2.7 |
| July |
5.20 |
0.1 |
4.02 |
0.1 |
5.27 |
0.1 |
3.26 |
0.1 |
4.44 |
0.1 |
| August |
6.26 |
0.1 |
5.37 |
0.1 |
8.85 |
0.2 |
1.97 |
0.1 |
5.61 |
0.1 |
| September |
35.1 |
0.6 |
6.38 |
0.1 |
10.7 |
0.2 |
10.39 |
0.4 |
15.6 |
0.3 |
| Total |
5,560 |
100.0 |
5,700 |
100.0 |
4,440 |
100.0 |
2,860 |
100.0 |
4,640 |
100.0 |
|
First posted October 3, 2012
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U.S. Department of the Interior |
U.S. Geological Survey