Adult fish are infrequently captured, but whenever I caught some, they were associated with eddies behind large boulders, logs, and bridge supports. Wintertime in Oregon means relentless rains and poor collecting conditions. In late spring, as water levels retreat, many disoriented sand rollers of various sizes can be seen, especially via flashlight, swimming along the river's edge. Sand rollers seem to be common where found. I have never caught them in streams that are consistently cool through summer.
Sand rollers make very good aquarium inhabitants, but several factors have to be kept in mind.
Needless to say, choose tankmates with care. Their water should be clean and contain some water flow to duplicate their natural conditions. Numerous plants and large rock caves will accommodate their nocturnal habits. Also, they can be slightly aggressive towards their own species, so limit crowding and provide adequate hiding spots. Frozen brine shrimp and bloodworms are eagerly taken as well as numerous live foods, including earthworms, live shrimp, and tubifex worms.