How to reach:
To reach the tidal bench marks from the intersection of main street and Washington State Highway 4 in Cathlamat, proceed east on state highway 4 for 10.8 km (6.7 mi) to the intersection with Wallen way. Turn right and proceed south on Wallen way for 250 m (820.2 ft) to the private residence at 11 Wallen way. The bench marks are located in the lawn area between the residence and the Columbia river, up a private drive way to State Highway 4, and from the driveway exit to the west along State Highway 4. The tide gauge is located on the southeast piling of a floating boat dock.