Telegraph Slough is the area off HWY 20; if Westbound, you will need to get into the left turn lane BEFORE the BIG bridge to come back Eastbound and the parking lot.
Welts / Samish is the 15 shell limit area off the Samish Exit off I-5 and West of Edison on the road to Samish Island; the parking lot is on the bend to Samish Island.
All of these units are part of the Skagit Wildlife Area. Also, check out the various divisions of the Lake Terrell Wildlife Area; especially, the Marietta Unit off the Slater Exit off I-5 before Ferndale. The parking area is on the right BEFORE the Nooksack Bridge; you need to park and walk across Slater Road to the blinds and the hunting area.
BTW: The tidal hunting of FIR ISLAND hunts a lot better if you read the tide book every time you intend to hunt it.