Close to the posted coordinates you will find an information kiosk. Use it to get the final.
N 49 07.ABC W 122 54.DEF
A = Briarwood Trail, first number
B = Briarwood Trail, first number
C = Briarwood Trail, second number
D = Lower Trail + Pinewood - Canyon Trail, second number
E = Gravity Bowl - Canyon Trail, second number
F = Briarwood Trail, first number
A + B + C + D + E + F = 22