Actually, there are signs with the Dawn to Dusk hours posted. There are at least 2 that I know of that are visible from Daybreak View Parkway. One near the Bridge and one near the old boat docks. They were installed during the fishing fiasco 2 years ago. I can't vouch for the existance of signs on other parts of the lake, I just know these are there becasue I drive by them everyday.

However, that does not condone the over zealousness of the security guard. With the shortening of the days, dusk is a different time everyday.