On the east shore of the Smith River (just a little north of where Highway 199 crosses it), I flipped an Oregon Garter Snake, T. atratus hydrophilus.
Garter #1: 19 mid-body scale rows, 8 upper labials, and 10 lower labials:


rest of photos here: http://www.naherp.com/viewrecord.php?r_id=144594
Then I flipped another rock a couple feet away, and got one with completely different coloration. This appears to be the Coast Garter Snake (T. elegans terrestris)
Garter #2: Mid-body scale rows 18/19, upper labials 8, lower labials 10.



rest of photos here: http://www.naherp.com/viewrecord.php?r_id=144595
I headed inland from the river a few hundred yards, when I got to an interesting habitat with rocky formations in a clearing. I flipped three garters there, all of which appear to be Northwestern Garters (T. ordinoides), though their counts and coloration are all over the place.
Garters #3 and #4

#3: 17 scale rows, 8 upper labials, 9/10 lower labials

#4: 17 scale rows, 8 upper labials, 8 lower labials

rest of photos here: http://www.naherp.com/viewrecord.php?r_id=144600
Garter #5: 17 mid-body scales, 7/8 upper labials, 8/9 lower labials


rest of photos here: http://www.naherp.com/viewrecord.php?r_id=144606
Finally, I hiked along the road a little ways further, and flipped another garter double under a rock. This time I got a Valley Garter Snake (T. sirtalis fitchi), along with another Northwestern.
Garter #6:

Garter #7: 17 mid-body scale rows, 7 upper labials, 8 labials


rest of photos here: http://www.naherp.com/viewrecord.php?r_id=144618
4 species, including a lifer subspecies, all within 350 yards and 1 hour. I really didn't expect that!