Santa Ana River Bicycle path

Runs from Huntington Beach to Orange–Riverside county line.

The route climbs steadily for most of its 4.5 miles, gaining 130 ft overall with the work concentrated in one sustained ascent. The main climb starts right off the line and runs 2.2 miles, gaining 80 ft at an average 0.7%.

The Santa Ana River Trail is a multi-use trail complex that runs alongside the Santa Ana River in southern California. The trail stretches 30 miles (48 km) from the Pacific Ocean at Huntington Beach along the Santa Ana River to the Orange–Riverside county line. Planned extensions of the trail reach to Big Bear Lake in San Bernardino County. When completed, it will be the longest multi-use trail in Southern California, at approximately 100 miles (160 km). In 1989, the Los Angeles Times described the path as "a veritable freeway for bicycles".

Text from Wikipedia, available under CC BY-SA 4.0.

At 4.6 miles, it is the longest of the 66 trails mapped in Walnut.