(Oregon)
Government Island is a 1,760-acre (710 ha) island in the Columbia River north of Portland, in Multnomah County, in the U.S. state of Oregon. Though Interstate 205 passes over it on the Glenn L. Jackson Memorial Bridge, access to the island is only by boat. There is a city controlled locked gate in the fence surrounding the freeway. (Ref: https://en.wikipedia.org/wiki/Government_Island_(Oregon))