Elochoman Slough Marina Nestled on the downriver side of Cathlamet, this is a full service marina. From SR 4/Main Street, turn onto Butler Street, go 1 block, turn right on Una Avenue and follow it down to the marina. In mid-July, the marina (and the town) play host to the Wooden Boat Festival, the Bald Eagle Festival, and an old-fashioned fireworks show.