VARNUM	NAME	LABEL	TYPE	LENGTH
1	SITE_ID	ID assigned to each site	2	25
2	YEAR	Sample Year	1	
3	VISIT_NO	Sequential visit number within year	1	
4	SAMPLED_SECCHI	Secchi transparency determined?	2	24
5	DATE_SECCHI	Date of Secchi transparency determination	1	
6	SECMEAN	Secchi transparency (m)(=avg. of disk disappearance and reappearance depths)	1	
7	CLEAR_TO_BOTTOM	Clear all the way to the bottom (Y/blank)	2	4
8	FLAG_SECCHI	Data Qualifier flag for Secchi determination	2	12
9	COMMENT_SECCHI	Comments and flag explanations for Secchi determination	2	140