Photo view from highway - Photo looking at Potters Marsh Driving south on The Seward Highway. Potters Marsh is part of the Anchorage Coastal Wildlife Refuge which extends from Point Woronzof southeast to Potter Creek, a distance of 16 miles, but is best known for that portion located between the Old and New Seward highways called “Potter Marsh.” Potter Marsh was created in 1917 with construction of the Alaska Railroad embankment.