I am suggesting impassible (as in, no way through to Tulameen) because of the following:

1- blocked at 2.9km
2- atv trail style bypass past Murphy lakes, puts you at about 8.5km on Lawless-Britton (very steep, lots of loose rocks, be very sure that you're comfortable getting down if you go up)
2- small (1/4 road?) washout between there and the bridge at 12.25km, my waypoint didn't save
3- the bridge at 12.25km has large blocks on the Tulameen side that someone has moved but could be put back in place
4- pretty significant crumbly washout at 15.5km - good enough for a Jeep size vehicle now, but I expect a significant rain could take it out (pictured)
5- blocks at lawless creek fsr and a no thru road sign

From that point the road is great going into Tulameen. I wouldn't recommend testing the washouts or going in with the goal of getting to Tulameen without the knowledge that you might be forced to turn around. But YMMV.