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Water Quality Information For Halfmoon Lake In Alton

Lake name: Halfmoon Lake
Towns: Alton
Barnstead
Lake area (acres): 282
Watershed area (acres): 4351.9252
Major watershed: Merrimack River
Mean depth (m): 4.4
Maximum depth (m): 8.2

Results

Parameter Value Single (S) or 
Average (A) 
Value
 
Minimum
Value
Maximum
Value
# of 
Measurements
Year Info Source
Total phosphorus (mg/L) 0.01 S 0.01 0.01 1 1992  
Secchi Disk
Transparency (m)
5.4 S 5.4 5.4 1 1992
     
Chlorophyll a (ug/L) 4.2 S 4.2 4.2 1 1992  
pH (units) 6.7 S 6.7 6.7 1 1992  
Acid neutralizing 
capacity (mg/L)
4.6 S 4.6 4.6 1 1992  
Macrophyte abundance Scattered/Common            
Trophic class Mesotrophic            

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