For those not familiar with the area...
Clapshaw Hill Rd intersects Gales Creek Rd (Hwy 8) just outside "town" in Gales Creek - about 5 miles outside of Forest Grove, a few miles before the Hwy 6 junction at Dorman's Pond. It's all private land in that area, and no place to park to hike under the bridge. Strange place for a deadline, but the majority of the creek runs through private land with little/no public access.
Right now the creek is very low water - fishing is likely very poor. I would doubt any salmon have made it up the creek - those that have made it up the Tualatin into Gales are probably in the lower reach of the creek near the mouth where the water is a bit deeper on average (probably best access will be the pull out on B street on the south end of Forest Grove)
I was just out fishing Dorman's Pond yesterday and the creek was really scary low. Even Dorman's pond is at the lowest I've ever seen it - there is an exposed land bridge cutting the eastern third of the pond off from the main body and there's a huge mud flat on the SE corner of the pond right now.
If Tualatin Basin coho are on the agenda - the lower reaches of the Tualatin will be the best shot by far - more water, more oxygen, and likely way more fish. Plus there's quite a bit of public access compared to the upper reaches of the system and the tribs.
This "Super El Nino" they're forecasting for this winter has me worried - they're predicting most of the country will be wetter than usual, while we here in the PNW will be drier than usual and will continue to see drought conditions. That sucks. My early prediction is that if the El Nino pans out like they say - we're going to see a repeat of the stream fishing restrictions next year, with an earlier start date to them, if not an outright stream fishing ban once summer kicks in. Bring your own parking space, and your own rock to stand on to fish whatever still water body you wish to fish on.
Gales, Rock, Dairy - and the Tualatin won't fare well with continued droughts and the fish will suffer. The coho on these streams are self sustaining wild populations - but another drought year might do them in.