Data period: through 2017
Town | County | Delorme Map # | True Basin | Flushing Rate |
---|---|---|---|---|
PORTAGE LAKE | AROOSTOOK | 63 | 1 | 11.16 flushes/yr |
Maximum Depth | Average Depth | Surface Area | Lake Volume | Drainage Area |
---|---|---|---|---|
8 m (25 ft) |
2 m (8 ft) |
1,000 ha (2,470 ac) |
23,400,000 m3 (18,971 ac-ft) |
176 km2 (68 mi2) |
Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.
Year | Color | Alk | SpCon | pH | TP-EC | TP-SG | TP-BG | TP-PG | SDT-Min | SDT-Avg | SDT-Max | SDT-n | SDT-b | Chl-Min | Chl-Avg | Chl-Max |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1974 | 22.0 | 112 | 13 | 2.7 | 3.0 | 3.4 | 6 | 1.7 | 2.4 | 2.9 | ||||||
1975 | 24.5 | 38 | 10 | 2.1 | 3.4 | 4.7 | 7 | 1.9 | 2.9 | 7.1 | ||||||
1976 | 12 | 2.5 | 3.0 | 3.7 | 6 | 0.8 | 2.8 | 6.5 | ||||||||
1977 | 7 | 3.2 | 3.2 | 3.2 | 1 | |||||||||||
1981 | 28.0 | 75 | 19 | 1.9 | 2.9 | 3.4 | 6 | 4.0 | 4.0 | 4.0 | ||||||
1982 | 2.6 | 3.1 | 3.4 | 4 | ||||||||||||
1986 | 17.0 | 52 | 13 | 3.3 | 3.3 | 3.3 | 1 | |||||||||
1989 | 3.6 | 3.6 | 3.6 | 1 | ||||||||||||
1994 | 2.8 | 3.0 | 3.3 | 3 | ||||||||||||
1995 | 2.5 | 3.2 | 3.5 | 6 | ||||||||||||
1996 | 1.7 | 2.9 | 3.9 | 5 | ||||||||||||
1997 | 19.0 | 48 | 7.4 | 19 | 16 | 2.1 | 3.3 | 4.2 | 7 | 3.2 | 3.3 | 3.4 | ||||
1998 | 1.8 | 5 | 32 | 2.8 | 3.4 | 4.0 | 6 | |||||||||
1999 | 22.5 | 59 | 10 | 2.7 | 3.4 | 4.9 | 7 | 5.1 | 5.1 | 5.1 | ||||||
2000 | 2.6 | 3.4 | 4.0 | 8 | ||||||||||||
2001 | 3.0 | 3.5 | 4.9 | 7 | ||||||||||||
2002 | 31 | 25.0 | 57 | 9 | 3.0 | 3.6 | 4.6 | 5 | 4.5 | 4.5 | 4.5 | |||||
2003 | 2.4 | 3.4 | 4.0 | 7 | ||||||||||||
2004 | 2.9 | 3.3 | 3.7 | 7 | ||||||||||||
2005 | 2.6 | 3.4 | 4.2 | 6 | ||||||||||||
2006 | 2.8 | 3.4 | 4.0 | 7 | ||||||||||||
2007 | 21 | 23.0 | 55 | 7.7 | 10 | 2.8 | 3.5 | 4.4 | 8 | |||||||
2008 | 2.4 | 3.1 | 3.5 | 8 | ||||||||||||
2009 | 3.0 | 3.4 | 3.8 | 8 | ||||||||||||
2010 | 2.6 | 3.4 | 3.9 | 7 | ||||||||||||
2014 | 4.2 | 4.6 | 5.0 | 2 | ||||||||||||
2015 | 3.1 | 3.2 | 3.3 | 2 | ||||||||||||
2016 | 30 | 27.0 | 58 | 7.6 | 12 | 3.0 | 3.3 | 3.5 | 2 | 2.8 | 2.8 | 2.8 | ||||
2017 | 3.3 | 3.4 | 3.4 | 1 |
Avg Color | Avg Alk | Avg SpCon | pH | Avg TP-EC | Avg TP-SG | Avg TP-BG | Avg TP-PG | SDT-Min | SDT-Avg | SDT-Max | SDT-n | Chl-Min | Chl-Avg | Chl-Max |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
27 | 21 | 56 | 7.5 | 16 | 11 | 11 | 1.7 | 3.3 | 5 | 5.2 | 0.8 | 3.5 | 7.1 |
Depth (m) | TEMP | DO | TEMP | DO | TEMP | DO | TEMP | DO | TEMP | DO | TEMP | DO | TEMP | DO |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 18 | 8.6 | 19 | 9.0 | 18 | 8.8 | 21 | 8.0 | 21 | 8.2 | 24 | 7.5 | 21 | 8.6 |
1 | 18 | 8.8 | 18 | 8.6 | 21 | 7.9 | 21 | 8.2 | 24 | 8.2 | 21 | 8.6 | ||
2 | 17 | 8.7 | 18 | 8.8 | 17 | 8.6 | 21 | 7.8 | 21 | 8.1 | 24 | 8.0 | 21 | 8.6 |
3 | 17 | 8.7 | 17 | 8.5 | 16 | 8.7 | 21 | 7.7 | 21 | 8.0 | 24 | 8.0 | 21 | 8.5 |
4 | 17 | 8.2 | 16 | 8.7 | 21 | 7.6 | 21 | 8.0 | 23 | 7.2 | 21 | 8.5 | ||
5 | 17 | 8.0 | 16 | 8.1 | 16 | 8.4 | 21 | 7.6 | 20 | 7.9 | 21 | 5.1 | 21 | 8.5 |
6 | 17 | 7.9 | 16 | 8.0 | 16 | 8.3 | 20 | 6.0 | 20 | 7.6 | 21 | 4.8 | 21 | 8.5 |
7 | 16 | 7.9 | 16 | 8.2 | 21 | 8.0 | ||||||||
8 | 16 | 7.9 | 21 | 7.8 |