Good point.<br /><br />I initially thought of the lake-related efforts as having to be conducted at (or nearby) the actual waters of&nbsp;the lake.<br /><br />It's possible that beneficial efforts could be made far from the lake (such as stopping the pollution that affects&nbsp;its&nbsp;sources of water). These efforts would not be "at' the lake but would still help eliminate the pollution that&nbsp;was&nbsp;adversely affecting the lake.<br /><br />Instead of using "of" the lake, though, I would now suggest "for" the lake. This would include all efforts by people (companies, towns) at the lakeside and in all of the surrounding areas.<br /><br /><br />