Chris, not only do you have worry about your your erosion control from the people coming in and out, but you need to worry about silting in. If your receiving any sort of run-off your lakes (I'm assuming their man-made and very shallow), could silt in on you in 2-3 years. When you said "during site evaluation"... was this your engineers? They should have gave you their recommendations and alternatives. If you do not yet have an engineering firm, GET ONE. Your site planning and cost estimates should include all of this. Where are you located? I have a couple of different firms I use around the country for my different projects.
I mainly use Either Coon Engineering or Crafton Tull & Associates. Coon is based out OKC and Crafton & Tull has offices throughout the country. Both do work all over the U.S., it's just a matter of rather or not they hold licenses in your state. If you would like a recommendation of someone a bit closer to home for you, let me know where your at and I'll refer you on to someone I've used on past projects.
(Message edited by Tanner on April 08, 2008)