Make a secchi disc ( see this http://en.wikipedia.org/wiki/Secchi_disk ) and get some pics like these. From your pics I would guess yours is about 12-14 inches.

See this thread it may help.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=259527&page=1

new lake




Lake 2 old





Lake 3 Murhead - the brown one






Last edited by ewest; 08/09/12 09:46 AM.