Re: Cashman Park? (NBT)
You can catch fish at Cashman at night, chunking does seem to be the most popular, and it is pretty convenient. Though if you want to fish the river on foot here are a couple places to try which may be more interesting.
Deer Island - access from the chain bridge (next to 95) between amesbury and nbpt, small parking lot. Fish the sandbar on the down river side or the rips along bridge.
Spring Lane off Ferry Road in Newburyport behind the little treatment plant, park on the road and walk down the grass.
Sweet Apple Tree Lane off Ferry Road in Salisbury, State land but not sure about parking these days. Hike down and fish the Rock (top half of the tide).