Many are deeply indented by narrow inlets. Topographic relief ranges from sea level to Mt. Constitution, which is 2,049 feet above sea level. The total coastline is about 375 miles, of which 270 miles remain in state ownership. The San Juan Islands' climate is relatively dry and moderate with the 28-inch average rainfall occurring chiefly during the winter months. Summers are cool, midsummer afternoon temperatures are about 70 degrees F, and winters are normally mild with small daily temperature variations.
Snow falls infrequently.
Return to top of page. The Friday Harbor Marina Expansion project, authorized in 1981 consists of 1,600 feet of concrete floating breakwater with recreational facilities. Allowing marina expansion to accommodate a total of 625 boats, the facility provides needed moorage facilities in the heavily visited San Juan Islands. In April 1991, the Port of Friday Harbor requested the Corps consider realigning and re-anchoring the south segment of its floating breakwater to allow additional maneuvering room for boats approaching a refueling and crane facility there. Reconnaissance design and cost estimates were completed in February 1992 on the realignment plan.