Oak Creek Quarry Loop Trail is a 9.6 mile loop trail located near Corvallis, OR that features beautiful wild flowers and is rated as difficult. The trail offers a number of activity options and is accessible year-round. Dogs and horses are also able to use this trail.
8 mile loop through old & new qrowth w/ 2000 feet of climb You can do this hike in either direction, but I like to go this way. At the information kiosk, go left (south) on a single track trail called Homestead, will will join with a fire road where you'll go right, then right again. A the junction of 6021, go left and start a long sustained climb to the top of 6021. At the top, this road becomes 770 which works its way across and down to the junction with 700 & 680. Stay right and take the 680 which heads down to the junction of 600 (or Patterson), take a right and follow the road back down to the parking lot.
I hiked this loop (just short of 12 miles) to combine Dimple Hill and McCulloch Peak (2155ft) into a long sustained workout... and to explore a little the McDonald forest. The forest is crisscrossed by a large number of interconnecting gravel/dirt road and trails. The complete section-by-section for the loop I followed is as follows:
Through the gate => right on Hocus Pocus Trail (.6 miles) => left on Fire road (left .2) => right on Face Trail (.6) => straight on Into The Wardrobe Trail (.2) => straight on RD 650 (.1) => Left on RD 600 - Patterson RD (1.4) => Right on RD 680 (.6) => Left on UPROUTE Trail (.1) => Right on INNUENDO Trail (.3) => Left on RD 680 (200 feet) => Left on RD 700 (.8) => Left on RD 760 (.4) => Short right spur to summit of McCULLOCH PEAK (.1) 2155ft.
Continue on SKILLING RD (.7) => Straight on VIEW RIDGE RD (1.7) => Left on Steep UTR Trail (.2) => Right on ?? RD (1.3) => Right on SKILLINGS RD (.3) => Left on ASLAN Trail (.4) => Left on RD 6021 (.8) => Right on HOMESTEAD Trail (.5)
This is not the most beautiful trail I have hiked in the area (I prefer trails to forest roads) but ease of access and lots of choices for a route still may motivate me to return. My favorites sections were the climb up Dimple Hill, The Innuendo Trail cut-off, the View Ridge road (I saw no one there and the road opens up to a few nice views) and the steep UTR Trail.
If you start this trail going right of the Kiosk (north) the end of the trail is through the woods (not on an established trail). Watch for a cairn on the right then head through the woods south to 6021 following the flags in the trees (this differs from the track shown here).