Hooray for Springwater!
Yes, at 267th Springwater runs out of spring and turns into a dirt trail. Telford road runs parallel to it for a bit. I've never gone down the trail beyond Boring, but scenic downtown Boring can be seen by taking hwy 212 left [east] at the end of Telford. I love going out that way and returning via 212 into the Sunnyside hills. Sunnyside connects up to I-205 path so you get a lot of quality time in quality bike paths and spacious shoulders.