4.7
(111)
1,617
riders
85
rides
Road cycling in San Diego National Wildlife Refuge offers diverse landscapes, including coastal salt marshes, wetlands, and inland oak woodlands. The region features varied terrain, from well-paved sections along the Sweetwater River to challenging climbs around Mother Miguel Mountain. Cyclists can experience scenic views of the Sweetwater Reservoir and the Pacific coastline. This area provides a mix of flat routes and routes with significant elevation gain.
Last updated: April 30, 2026
4.8
(5)
175
riders
66.6km
03:30
1,200m
1,200m
The Lyons Valley loop offers a difficult road cycling experience, covering 41.4 miles (66.6 km) with a significant elevation gain of 3941 feet (1201 metres). You can expect to complete…
5.0
(1)
32
riders
60.9km
02:54
750m
750m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.

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14
riders
45.4km
02:05
490m
500m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
6
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
7
riders
45.4km
02:29
920m
920m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
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The Sweetwater River is a small year-round stream that flows 55 miles from the Cuyamaca Mountains to the San Diego Bay.
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The Steele Canyon Bridge, also known as the Sweetwater River Bridge, is a beautiful landmark crossing the Sweetwater River. It is on the National Register of Historic places, and is no longer used for vehicles but is a great hiking, running or biking spot.
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This trail runs between the recently renovated Mast Park with the San Diego River. Along the way, you'll enjoy the calming sounds of the river and have the opportunity to spot wildlife in the area.
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The Sweetwater River flows from Loveland Dam passing through Lake Emma, where the river bends west and runs parallel to Dehesa Road. The lake is fenced off and access is limited. At the western end of the lake is a golf club.
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As you hike around the south side of the Upper Otay Reservoir you get a good view of the dam. The wall and graffiti are a cool contrast in between the upper and lower reservoir waters.
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Hollenbeck Canyon Wildlife Area provides a 6,100-acre wildlife corridor between Otay Mountain and the Jamul Mountains. This mainly includes coastal sage scrub, chaparral, oak woodlands, riparian forests, freshwater marshes, and grasslands. The height range hovers between a low of 750' to 2,100'. There are official designated hiking trails for visitors to hike.
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Lower Otay Reservoir is filled by the Otay River and a San Diego Aqueduct bringing water from the Colorado River. The dam attached to it is known as Savage Dam and was built in 1918. It is a beautiful landmark to hike around and enjoy the calm of the water.
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The refuge offers a diverse range of landscapes. You'll encounter critical habitats like coastal salt marshes and intertidal mudflats, especially in the San Diego Bay units. Inland, the terrain shifts to coastal sage scrub, chaparral, oak woodland, and freshwater marsh. Many routes also provide scenic views of the Sweetwater Reservoir and the prominent Mother Miguel Mountain.
Yes, the refuge offers routes suitable for various fitness levels, including beginners. The Sweetwater River loop from Rancho San Diego is an easy, well-paved option. The Sweetwater River Trail is also known for its mostly well-paved surfaces, making it great for those new to road cycling.
For a more challenging experience, consider routes with significant elevation gains. The Lyons Valley loop is a difficult 41.4-mile route with substantial climbing, offering scenic views around Barrett Lake. Another demanding option is the Lyons Valley Trading Post loop from Rancho San Diego, which also features considerable elevation.
Yes, several routes are suitable for families. The San Diego Coastline Trail, running from Chula Vista to Coronado, is approximately 12.5 miles and accommodates all skill levels. The Sweetwater River Trail also features mostly well-paved surfaces, making it a good choice for a family outing.
While cycling, you can enjoy views of the Sweetwater Reservoir and the historic Steele Canyon Bridge, which is now dedicated to outdoor activities. The Mother Miguel Mountain Summit Rockhouse offers panoramic views, and the Sweet Water River Trail itself is a highlight for many cyclists.
Absolutely. The San Diego National Wildlife Refuge is a haven for wildlife, particularly birds, with over 370 species recorded, including many endangered ones. You might also spot other endangered species like the Quino checkerspot butterfly and the San Diego horned lizard. The coastal salt marshes and wetlands are prime areas for birdwatching.
San Diego generally enjoys mild weather year-round, making road cycling pleasant in most seasons. However, the spring and fall often offer the most comfortable temperatures, avoiding the hotter summer days and any potential winter rain. Always check the local forecast before heading out.
Yes, many routes in the refuge are designed as loops. Popular options include the challenging Lyons Valley loop and the moderate Sweetwater River loop from Rancho San Diego. These loops allow you to experience diverse scenery without retracing your path.
Regulations for dogs can vary within different units of the refuge. Generally, dogs are often permitted on leash on designated multi-use trails, but it's crucial to check specific rules for areas like the Sweetwater Marsh Unit or South San Diego Bay Unit before bringing your pet. Always ensure your dog is leashed and you clean up after them.
While the refuge itself is focused on conservation, areas like Rancho San Diego, which serves as a starting point for routes such as the Mission Trails Regional Park – Old Mission Dam loop, offer various amenities including cafes and restaurants. You'll find more options in the surrounding communities like Chula Vista or Coronado, especially along the San Diego Coastline Trail.
Parking is typically available at various access points and trailheads around the refuge. For example, if starting a route from Rancho San Diego, you'll find parking facilities there. It's advisable to check specific trail access points for designated parking areas before your ride.
The area is highly rated by the komoot community, with an average score of 4.7 stars from over 50 reviews. Cyclists often praise the diverse landscapes, from coastal views to inland oak woodlands, and the variety of routes catering to different skill levels. The well-maintained paths and scenic beauty are frequently highlighted.


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