a lot of coastal rivers have low water right now but when the tide rolls in the chromers move in and will hold in the mid depth pockets in the lower river waiting for rain and sometimes i have observed them this time of year near breaks in the current at the head of a run just before it drops off into deep water.. also, targeting rivers that have obstructions such as waterfalls fish can't pass during low water events is a good idea because it saves you a lot of searching and if there are fish anywhere in the river you know they are limited to the water below that obstruction.