San Diego Creek and Aliso Creek Trail Loop

The route primarily uses paved, wide, and well-maintained multi-use paths. The San Diego Creek Trail section is generally flat and easy, featuring underpasses for continuous flow. The Aliso Creek Trail section has a consistent gradual incline, with some parts having short, steep grades and occasional uneven pavement due to root heaves and cracks.

While both the San Diego Creek and Aliso Creek Trails are generally accessible, combining them into a full loop results in a longer ride of approximately 68 km (42 miles) with over 750 meters of elevation gain, making it rated as difficult. Beginners might find individual sections of each trail more suitable, but the full loop requires a good level of fitness and experience.

You'll experience a diverse range of scenery. The San Diego Creek Trail offers views along the creek, shaded areas near parks, and runs adjacent to the Upper Newport Bay Nature Preserve, known for bird-watching. The Aliso Creek Trail transitions from urban settings to more natural canyons, meadows, and rolling hills, following Aliso Creek with opportunities to spot local wildlife.

These two trails are not a single, formally designated loop. To connect them, you will need to utilize bike lanes on surface streets or other connecting trails within Orange County's extensive network. For example, the San Diego Creek Trail connects to Los Olivos Trail and other city bike lanes, and the Aliso Creek Trail has multiple access points that link to parks and facilities. Careful planning of these interstitial sections is recommended.

Yes, the route follows San Diego Creek, offering scenic views. Near its western end, the San Diego Creek Trail runs by the Upper Newport Bay Nature Preserve. The loop also brings you close to Salt Creek Beach, providing a coastal highlight.

While rideable year-round, spring and fall offer the most pleasant temperatures for cycling this loop. Summers in Southern California can be very hot, especially in the afternoon, so consider riding early in the morning during those months.

Both the San Diego Creek Trail and the Aliso Creek Trail have multiple access points with convenient parking available at various parks and facilities along their routes. You'll find amenities like parking, restrooms, and water fountains at several locations.

Generally, dogs are allowed on leash on most multi-use trails in Orange County, including sections of the San Diego Creek and Aliso Creek Trails. However, specific park regulations or protected areas along the route might have different rules, so always check local signage.

No, there are no specific permits or entrance fees required to cycle the San Diego Creek and Aliso Creek Trails themselves. They are public multi-use paths.

Yes, this route is part of an extensive network. It utilizes sections of the San Diego Creek Bike Trail, Aliso Creek Bikeway, Salt Creek Trail, and Jeffrey Open Space Trail, among many others, allowing for varied and extended rides throughout Orange County.

Along the Aliso Creek Trail, you might observe local wildlife such as various birds, rabbits, and deer, especially in the more natural canyon and meadow sections. The San Diego Creek Trail, particularly near the Upper Newport Bay Nature Preserve, is excellent for bird-watching.