If you are driving down from Anchorage to Seward, you will find Potter Marsh off the highway. It is free for the public to stop and view wildlife (birds in particular) on the observation deck. There is plenty of parking made available and also public restrooms (porta potties).
From one of the boards, I read, if you come during late April through September, you may be able to see Canada geese, northern pintails, canvasback ducks, red-necked phalaropes, horned and red-necked grebes, and northern harriers (in which they use these wetlands).
If you have binoculars, make sure to bring them with you to view some of the birds that you will definitely see.
Please note that dogs are not allowed on the observation deck. But since my husband and I travel with our special dog fitted backpack, we were able to have our little girl dog in our backpack as we walked and explored.
We spent a little over 30 minutes walking the entire observation deck and enjoyed the sights. But please note that it was pretty windy at times (we visited towards the end of August, which happens to be a somewhat rainy month). Also there is no shade covering so if the direct sunshine would bother you, bring a hat to shield your face like I did. read more