Take I-5 north to the Walnut Grove Exit.(check mileage)

Go West on Walnut Grove-Thorton Rd. to River Rd.

Turn right on River Road to the Courtland Bridge.

Cross the bridge, turn right on River Rd.

Go 1/2 mile and turn left onto Courtland Rd. Stay on this road
(it curves sharpely left) till you get to the fork in the road just
before the Ryer Island Bridge.
(Road name changes to Ryer Rd./HWY 84 at the sharp turn).

Turn right onto Holland Rd(which is the fork and 21.6 miles from I-5),
go up onto the levee and continue to ARROWHEAD HARBOR.