That's a great idea!  Road maintenance can definitely have an impact on lakes, so it should be a natural partnership.  Years ago, the legislature was about to repeal the "private ways" statutes because the archaic term "private way" had been replaced with the term "public easement" to reflect the fact that this term referred to roads that were in fact public.  Since private individuals couldn't be compelled to pay to maintain a public road, it made the entire series of laws useless.  It was the lake associations that stepped up and joined the fight to re-work the laws so they could be applied to private roads.   (The term "private way" has since been inserted back into the law, but that's another controversy.)

I don't know what area you are in, but in Bridgton we have the Lakes Environmental Association (LEA).  Several years ago they contacted us and told us they had inspected our road and found two culverts that could impact Woods Pond if they washed out.  None of our properties has frontage on Woods Pond, so it wasn't even really on our radar.  However, both culverts had been known to flood over the road after torrential rains, and we hadn't had the money to replace them with bigger culverts.  LEA helped us get a matching grant to replace both culverts.   We have had several torrential rains since then, but the new culverts have handled them just fine.

I hope you can find a lake association that will partner with you, and that other road associations and lake associations will also join forces.  It seems like a symbiotic relationship.