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The long fetch coming from the west and northwest can provide downwind waves with a wind that does not have to be as high as the wind sometimes needed in Bellingham Bay. Look here on days with a west or particularly a NW wind starting in the mid teens for downwind laps.
To get better surfing waves to the shore you may need somewhat higher northwest winds. Since it's a point break at Birch Bay State Park, the wave tends to peel so you can find a spot for a SUP in the pocket or for a surfski out on the shoulder. The long fetch makes for much longer period waves as long as the winds at Birch Bay aren't nuking.
** Make sure you are not going to hit low tide and get stranded by the shallow shoreline mud flats.