Is there WiFi at Howard Miller Steelhead Park?
Not sure why you asked this on the Lynden forum. The park is in Rockport and I seriously doubt WiFi is available there.
Do you really mean wifi, or just data/4g on your phone? If the latter, your provider will have a coverage map on their website. These aren't always100% accurate, and if you have an older phone you might not get as good coverage as you should, but it gives you a clue at least.
Never hurts to ask! Someone from Lynden may know.I heard quite a few go there!