Did a route clinch of WA 310 on Kitsap. Nothing special considering it is only a couple miles long but I'm hoping to get all of 303, 304, 308, and maybe 305 in before I head back out:
https://flic.kr/s/aHsmhB7Esx
Updated the WA 310 with a blog entry. Not much really too historical here other than noting what the alignment of WA 3/PSH 21 was before the freeway:
http://surewhynotnow.blogspot.com/2018/05/washington-state-route-310.html