Water Body Type

Refers to water body type as indicated in MDNR's PWI. PWI
serves to document all public waters (lakes and wetlands) and
assign individual ID numbers. (consistent with Bulletin 25).
However some lakes in Bulletin 25 are really protected wetlands
and are coded as "W" whereas protected lakes have the codes
"P" or "L" in the
PWI. Lakes that are "wetlands" based on the PWI were
not
assessed for the 303(d) list, however this differentiation was
not made for the 305(b) assessments noted herein. Waterbodies
designated with an "O" are neither lake or wetlands but are still
protected (ex. Reservoirs). A nonprotected waterbody is denoted
by the letter "N".