Lewis and Clark Reservoir at Weigland Beach (Sampling Site 23) |
The table below shows the most recent sampling information
for toxic algae (Microcystin)
and bacteria (E.coli)
,
Samples are typically collected on Monday and posted on the
web site on Thursday or Friday.
On the table below, the level to trigger a toxic
algae Health Alert is 20 parts per billion
for the toxin Microcystin. Health Alerts stay in
effect until the level stays below 20 ppb for
two consecutive weeks |
|
In the Bacteria (E.coli) column, a single sample
of 235 counts (or higher) per 100 ml
is considered a higher risk for illness through
ingestion |
.
Week Starting |
Weekly Health Alert |
Level of Microcystin (ppb) |
E. coli (# per 100 ml) |
May 2, 2011 |
No |
0 |
15 |
May 9, 2011 |
No |
0 |
299 |
May 16, 2011 |
No |
0 |
76 |
May 23, 2011 |
No |
0.1 |
10 |
May 30, 2011 |
No |
0 |
51 |
June 6, 2011 |
No |
0 |
35 |
June 13, 2011 |
No |
0 |
131 |
June 20, 2011 |
No |
0 |
79 |
June 27, 2011 |
No |
0 |
3.466 |
July 4, 2011 |
No |
0 |
29 |
July 11, 2011 |
No |
0 |
69 |
July 18, 2011 |
No |
0 |
50 |
July 25, 2011 |
No |
0 |
147 |
August 1, 2011 |
No |
0 |
22 |
August 8, 2011 |
No |
0 |
32 |
August 15, 2011 |
No |
0 |
32 |
August 22, 2011 |
No |
0 |
15 |
August 29, 2011 |
No |
0 |
83 |
September 5, 2011 |
No |
0.1 |
0 |
September 12, 2011 |
No |
0 |
22 |
September 19, 2011 |
No |
0 |
62 |
September 26, 2011 |
No |
0 |
10 |