Rob , I have experienced lots of 4-6 foot waves in fresh water and never thought to take a picture either .

Been to Mead twice seen 6' waves both times( thought I was going to die both times)

fished Clear lake one spring with a strong north wind blowing and lots of 4-6' waves thru the middle section of the lake

Delta in spring of 99 gale force westerly winds and outgoing tide and was running san joaquin river main channel between fishermans cut and B&W (Moke river) and the whole river was 5 swells with an occassional wave of 6' that would always seem to break over the bow no matter how I tried to time powering over it .

one time in november 97 @ Don Pedro I was fishing in Big creek and a major winter storm was forecast . These big gusting winds came up blowing in from the south . The waves went from around 8" to 3-4-5 feet in a couple of hours . I couldn't believe it because I had never seen anything like that at that lake before.