Biking in Seaside

The beauty and panorama of the Necanicum Watershed that nurtures Seaside is easy to enjoy on two wheels. The bike routes displayed for the area offer options for choosing roads and trails to best suit your travel style and equipment. They range from easy to strenuous challenges. Download your trail choice, pack a picnic lunch, strap on your helmet and pedal your way through bikeways of our forests and flatlands. For bike rentals, please see options below.

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Biking Trails of Seaside

Understand Seaside's mountain biking rules and trail etiquette. Download PDF.

500 Mainline and Cullaby Creek

  • TRAIL DISTANCE

    6.3 miles

  • ELEVATION GAIN

    403 ft.

  • Maximum elevation

    365 ft.

  • Difficulty

    Easy

Trail Description

This is another good route to try before attempting longer and more difficult routes. The ride route starts at Entry Gate 72 on the north side of Lewis and Clark Road across from the parking area. The route follows the Lewis and Clark Mainline a short distance to the 500 Mainline. The route then follows the 500 Mainline climbing a low hill and passing the Warrenton Water Plant before reaching Airplane Crossover Road. There are several nice views of the coast along the 500 Mainline. Following Airplane Crossover, the route descends to Cullaby Creek, passes through a pretty canyon and then climbs out of the canyon to a junction with the Lewis and Clark Mainline. Following the Lewis and Clark Mainline, the route returns to the entry gate.

The Ride

Cross Lewis and Clark Road heading north and follow the Lewis and Clark Mainline 0.1 mile to Entry Gate 72. Go through or around the entry gate on the left and continue on the Lewis and Clark Mainline less than 0.1 mile to the 500 Mainline. Turn left onto the 500 Mainline and go through or around Gate 69. Continue on the 500 Mainline.

  • At 1.5 Miles pass the Warrenton water plant on the left.
  • At 2.5 miles turn right onto Airplane Crossover.
  • Follow Airplane Crossover descending to Cullaby Creek at 3.5 Miles.
  • Continue on Airplane Crossover to Gate 109 and the intersection with the Lewis and Clark Mainline at 4.3 Miles.
  • Turn right onto the Lewis and Clark Mainline and ride 2.0 miles back to the entry gate.

Technical

Ride Time: 45 minutes. Several short, moderate climbs and descents. Route may become overgrown in summer months beyond the Warrenton water plant. Expect weekday truck traffic on the Lewis and Clark Mainline.

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Lewis & Clark Mainline (Upper)

  • TRAIL DISTANCE

    Lewis & Clark Mainline (Upper)

  • ELEVATION GAIN

    721 ft.

  • Maximum elevation

    936 ft.

  • Difficulty

    Moderate

Trail Description

The route is an extension of Seaside Visitor Bureau Mountain Bike Route 1, The Lewis and Clark Mainline. Beginning at the turn-around point for Route 1, the route continues to follow the Lewis and Clark Mainline to its intersection with Saddle Mountain Road. Beyond the turn-around point for Route 1, the original road was washed out in a flood forcing a 2-mile detour higher up the side of the canyon. This portion of the route includes a moderately steep climb and descent. The final 2.5 miles resumes a gentle climb to Saddle Mountain Road. The combined routes offer two options to riders. They can be done as a 22-mile round-trip loop beginning and ending at the Entry Gate 71 at Lewis and Clark Road. They can also be done as an 11-mile one-way ride by arranging for a pick up at Lewis and Clark Mainline Entry Gate 57 at Saddle Mountain Road which is accessible by car. The route provides some pretty views of the Coast Range Mountains including the north side of Humbug Mountain. There is a pleasant view of the Lewis and Clark River from a small bridge just off of the Lewis and Clark Mainline at Bridge 11 Road.

The Ride

If you are tracking your distance traveled from Entry Gate 71 at Lewis and Clark Road, add 6.9 miles to the mileage points on this route. Beginning at the turn-around point for Ride Route 1, follow the Lewis and Clark Mainline making a turn to the left to a steep, 1-mile climb followed by a steep 0.6-mile descent. Keep to the right at all of the intersecting roads until you have reached the bottom of the descent.

  • At 1.8 miles reach the intersection with Bridge 11 Road on the right. A short distance from the Lewis and Clark Mainline on Bridge 11 Road there is a small bridge with a nice view of the Lewis and Clark River. Continue on the Lewis and Clark Mainline keeping to the right at all of the intersecting roads to Entry Gate 57 at Saddle Mountain Road.
  • At 4.1 miles go through or around Entry Gate 57 and ride a short distance across a bridge to reach Saddle Mountain Road. Follow the same route back to return to the turn-around point for Ride Route 1.

Technical

Ride Time: 1 hour. Steep climbs and descents on rough gravel road surface. Expect truck traffic during weekdays. Climbs at an average grade of 6% for 1 mile. Descends at an average grade of -7% for 0.6 mile. Climbs at an average grade of 2% for remaining 2.5 miles to the turn-around point. Climbs and descents are reversed on return.

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Davis Point Summit

  • TRAIL DISTANCE

    3.2 miles

  • ELEVATION GAIN

    484 ft.

  • Maximum elevation

    1,900 ft.

  • Difficulty

    Hard

Trail Description

This route is a side trip adding 3.2 miles and 484 feet of elevation gain to The Little South Fork Crossover, Ride #5. It should only be attempted by experienced riders looking for a more challenging ride. The climb to the summit will give most riders an opportunity to spin those big gears on the rear cassette. The view from the summit makes the effort worthwhile. On a clear day some of the peaks of the Cascade Range are visible as well as the mountains on the Olympic Peninsula to the north. The sheer face of Saddle Mountain looms to the east with a panoramic view of the north coast to the west. The small shed on the summit is a working radio relay station. Do not enter, climb on, or otherwise disturb the building or antenna equipment.

The Ride

Follow the route of Ride #5, The Little South Fork Crossover to the 3-way junction at 6.5 miles.

  • Turn right at the junction and continue to follow the 300 Mainline, bearing left at the intersection with the 325 Road (unsigned).
  • At 0.9 miles from the junction, turn left onto Spur Road 326 (unsigned) and ride through Gate 64.
  • Follow Road 326 to the summit keeping to the left at the intersecting spur roads.
  • Follow the same route back to the 3-way junction.
  • At the junction, turn right onto the Little South Fork Crossover Road to follow the remainder of the Ride #5 route adding 3.2 miles to the mileage points on the route beyond the 3-way junction.

Technical

Ride Time: 30 minutes. Difficult. Average grade of 9% for 0.6 mile from the 300 Mainline to the summit. The climb from the 300 Mainline to the summit is steep with some moderately technical sections. Most challenging is the last 0.1 mile which is a climb up a 20% grade over loose rock. Maintaining rear wheel traction in this section is difficult. The descent through this section is equally challenging.

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321 Spur Road

  • TRAIL DISTANCE

    1.75 miles

  • ELEVATION GAIN

    297 ft.

  • Maximum elevation

    1,666 ft.

  • Difficulty

    Hard

Trail Description

This route is a side trip adding 1.75 miles and 297 feet of elevation gain to The Little South Fork Crossover, Ride #5. It should only be attempted by experienced riders looking for a more challenging ride. While the climb is moderately steep, the real challenge of this route is the poor condition of the road. At one point the road seems to disappear into some small trees. Don’t give up. In about 100 feet, the road opens up again with a short climb to the summit. The panoramic view of Seaside and the North Coast is worth the effort. The route stops at a nice viewpoint and then returns over the same route back to the 300 Mainline.

The Ride

Follow the route of Ride #5, The Little South Fork Crossover to the 3-way junction at 6.5 miles.

  • Turn left at the junction onto Spur Road 321.
  • Keep left at the first spur road intersection.
  • Keep right at the second spur road intersection.
  • At 0.7 miles the route reaches the high point.
  • At 0.87 mile the route turns around and follows the same route back to the 300 Mainline.
  • The spur road continues and is rideable for about another 0.5 mile beyond the turn-around point.
  • Follow the same route back to the 3-way junction.
  • At the junction, turn left onto the Little South Fork Crossover Road to follow the remainder of the Ride #5 route adding 1.75 miles to the mileage points on the route beyond the 3-way junction.

Technical

Ride Time: 20 minutes. Difficult. Average grade of 7% for 0.7 mile with two short, steep climbs in excess of 10%. The road is not maintained and has become rough and overgrown in places. However, with some determination, an experienced rider can push their way through the small trees and achieve the summit.

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Twin Peaks

  • TRAIL DISTANCE

    4.8 miles

  • ELEVATION GAIN

    754 ft.

  • Maximum elevation

    1,506 ft.

  • Difficulty

    Hard

Trail Description

This route is a side trip adding 4.8 miles and 754 feet of elevation gain to the 300 Mainline, Beerman Creek, Necanicum Mainline Loop, SVB Ride #6. It should only be attempted by experienced riders looking for a more challenging ride. The Twin Peaks are the two prominent hills visible looking south from Seaside. They are located near the junction of Hwy 101 and Hwy 26. The route follows a primitive road to the summit of the western twin. The climb is tough, but the view is fantastic. There is currently no known route to the summit of the higher, east twin.

The Ride

Go through or around Entry Gate number 71 on Lewis and Clark Road and ride straight ahead on the paved road 0.6 mile and past a chain link fenced area on the right side. Just past the fenced area turn right onto the 300 Mainline and ride through or around Gate 73.

At 1.6 miles veer left, ride past the 1 mile sign and continue on the 300 Mainline.

At 3.9 miles, the 300 Mainline reaches the top of the ridge and the intersection with the 306 Road. Continue straight ahead on the 300 Mainline.

At 5.6 miles turn right onto the 320 Road. Climb to the ride high point and follow a sweeping descent and curve to the right. Keep to the right at the intersecting road at 6 miles. Go straight ahead at the junction and continue to follow the 320 Road

At 1.1 miles from the junction pass a road sign on the right side labeled “E HWLY”. Turn right onto the unsigned road and begin the climb to the summit.

After climbing 0.5 mile the road reaches a flat stretch and an intersecting road. Continue riding straight ahead for 0.1 mile and take the road to the left at the next intersection. Begin another steep climb.

After climbing 0.4 mile, the road reaches the saddle between the Twin Peaks. Continue straight ahead another 0.3 mile and up a short, steep climb to reach the summit of West Twin Peak. Follow the same route back to the 320 Road and then to the 3-way junction on Ride #6.

At the junction, turn left onto the Nec 60 Road to follow the remainder of the Ride #6 route adding 4.8 miles to the mileage points on the route beyond the 3-way junction.

Technical

Ride Time: 45 minutes. Difficult. Average grade of 9.5 % for 1.1 miles from the 320 Road to the saddle. Several pitches are in excess of 20%. The climb from the 320 Road to the summit is very steep on a primitive road that receives little traffic. Loose rock on this road can make traction challenging on the climb and the descent.

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