The Online Lower Minnesota River Watershed District News, December 2004
  Firemen's Brickyard Courthouse
Surface area (ac) 8 17 10
Maximum depth (ft) 23 43 57
Mean depth (ft) 7 23 25
Watershed area (ac) 31 72 7
Watershed / lake ratio  4:1 4:1 1:1
Residence time (yr) 4 6 26
 

Clayhole Lake Data

Table 1 from the Bonestroo report.

Watershed area and ratio numbers reflect the effect of the diversion storm sewers.