About
St. Croix River, Maine New Brunswick — 1604 Saint Croix Island, 1842 Webster Treaty, 1968 Wild/Scenic 100-mi. From Washington County through 114 miles of international waterway, the St. Croix forms part of the border between Maine and New Brunswick. The upper 30 miles from Vanceboro to Loon Bay run Class I-II through remote boreal forest within the Moosehorn National Wildlife Refuge corridor. Below Grand Falls, 40 miles of Class I water to Calais show tidal influence from Passamaquoddy Bay. At 1800 CFS average with an optimal range of 500-3000 CFS, the St. Croix carries substantial volume year-round. Sunrise Canoe and Kayak provides outfitting services for paddlers tackling the longer wilderness sections. The St. Croix International Waterway designation protects the cross-border watershed, maintaining the undeveloped character that defines much of this system. USGS gauge 01021000 tracks conditions for trip planning.
River conditions are community-verified. CFS ranges, difficulty ratings, and access points may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level.