Upon researching, there seems to be no available information on a boat ramp named Gilbert River Transient Tie-Up in Washington with the given latitude and longitude coordinates.

However, there is a Gilbert River Boat Ramp located in Wahkiakum County, Washington (latitude: 46.2957, longitude: -123.5625), which may be the ramp in question. According to the official website of the Washington Department of Fish and Wildlife, Gilbert River Boat Ramp is a primitive boat launch that provides access to the Columbia River. The ramp is reportedly 40 feet wide and can accommodate small to medium-sized boats.

The Columbia River is a large body of water that spans across several states, including Washington. The river is home to various species of fish, such as salmon and steelhead, making it a popular spot for recreational fishing. Motorized boats, canoes, kayaks, and other non-motorized crafts are allowed on the Columbia River.

In conclusion, the information available suggests that the Gilbert River Boat Ramp in Wahkiakum County, Washington, is a primitive boat launch that offers access to the Columbia River. The ramp is 40 feet wide and can accommodate small to medium-sized boats. Motorized and non-motorized craft are permitted on the Columbia River.