I'd fish to a likely looking area such as pads if there not showing there properly hiding somewhere pads, overhanging trees snags ect is most likely place they would be. If your there for 24 hours at this time of year if you look hard enough you will usually see a sign at sum point paticularly in the morn. Id only ever fish gravel spots if I seen fish there. Personally don't get the obsession with finding gravel the main reason I'd want to find gravel is so I can avoid it and make sure I'm fishing in the silt.