Scientific Investigations Report 2006–5060

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5060

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Table 5. In-lake annual scenario results for ammonia, orthophosphate, chlorophyll a, and blue-green algae, Hagg Lake, Oregon.

[The length of the blue-green algae bloom was calculated as the time their concentration was greater than 0.5 gram per cubic meter. The photic zone was estimated to include the top 10 meters of the water column, on the basis of light profiles measured in Hagg Lake. Abbreviations: μg/L, microgram per liter; N, nitrogen; P, phosphorus]

Scenario Ammonia, mean whole-lake
(µg/L as N)		 Ammonia, maximum in hypolimnion
(µg/L as N)		 Orthophosphate, mean, whole-lake
(µg/L as P)		 Orthophosphate, mean, photic zone
(µg/L as P)		 Chlorophyll a, photic zone
(µg/L)		 Length of blue-green algal bloom
(days)
2002
0 Base 12.9 251 5.05 4.17 1.65 66.4
1 a 11.9 147 5.35 4.23 1.45 69.2
b 12.0 212 5.22 4.12 1.54 70.2
2 a 10.6 28.8 5.41 4.27 1.22 43.0
b 10.5 201 5.37 4.28 1.18 29.0
3 a 10.7 39.9 5.51 4.32 1.25 47.0
b 10.7 97.9 5.49 4.38 1.29 37.0
4 a 10.6 13.6 5.61 4.31 1.36 64.8
b 10.6 228 5.56 4.31 1.37 60.4
5 a 11.4 99.3 5.45 4.26 1.39 64.2
b 11.8 189 5.26 4.09 1.53 69.6
6 a 10.5 11.3 5.51 4.28 1.17 42.4
b 10.4 129 5.43 4.29 1.05 0.0
7 a 10.5 11.2 5.61 4.23 1.27 54.0
b 10.5 61.3 5.55 4.29 1.28 46.2
8 a 10.5 10.9 5.69 4.31 1.29 58.6
b 10.4 169 5.60 4.31 1.30 49.6
9 a 11.3 43.1 5.67 4.37 1.37 64.6
b 11.7 208 5.43 4.17 1.53 70.4
10 a 11.2 40.3 5.63 4.38 1.36 64.4
b 11.6 209 5.39 4.20 1.52 70.4
11 a 10.4 10.7 5.64 4.43 1.12 38.2
b 10.3 148 5.50 4.36 1.08 0.0
12 a 10.5 10.7 5.77 4.35 1.31 62.0
b 10.5 64.6 5.63 4.34 1.31 49.4
13 a 10.3 10.6 5.83 4.44 1.27 52.0
b 10.1 68.3 5.62 4.27 1.31 39.4
14 a 12.0 11.9 9.27 6.87 1.55 50.2
b 11.8 27.2 9.20 6.86 1.54 23.2
15 a 12.2 38.2 6.49 4.96 1.79 42.4
b 12.2 229 6.44 5.01 1.75 1.4
2001
0 Base 12.6 183 4.68 4.23 1.06 42.6
14 a 10.8 106 5.28 4.46 0.88 0.0
b 10.7 263 5.17 4.37 0.96 0.0
15 a 10.9 121 5.28 4.47 0.89 0.0
b 10.8 281 5.18 4.40 0.96 0.0

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