"No Dogs or Horses." "No Bikes." Those rules are printed in bold on Riverside County Parks' 2026 trail map for the Santa Rosa Plateau Ecological Reserve, listed under "Trail Rules" just below the day-use fees.
The county prints a second 2026 map for the same street address, 39400 Clinton Keith Road. That map covers the Sylvan Meadows Multi-Use Area, and its rules say "Dogs Must Be on 6ft Leash" and "No OHV or E-Bikes." People call the whole thing "the Plateau," but it runs on two rulebooks. For anyone in Bear Creek who heads west on Clinton Keith for a weekend walk, the right side of the Plateau depends on who's coming along.
One Address, Two Rulebooks
The Ecological Reserve is the larger, protected core. The county's live page for it says plainly, "No dogs allowed on trails." The trails on the reserve map include Vernal Pool, Adobe Loop, Granite Loop, Punta Mesa, Lomas, Oak Tree, Vista Grande, Waterline Road, Tenaja Truck Trail and Hidden Valley Road, among others.
Sylvan Meadows covers nearly 1,000 acres and about 10 miles of trail. RivCoParks says it's open to hikers, bikers and equestrians on routes of "easy to moderate difficulty." Its page says dogs are "allowed with 6ft leash on trails."
Admission costs the same on both sides: $6 per adult and $3 per youth. Sylvan Meadows adds a $2 fee for each dog or horse. Under the county's regional park rules, "child/youth" means 12 and under, children under 2 get in free, and each group can bring no more than three dogs and horses combined.
Sorting the Outing by Who's Coming
Because the two sides follow different rules, the guest list decides the destination.
- The dog. Sylvan Meadows is the only option. Bring a leash no longer than six feet and $2 for the dog's fee.
- The mountain bike. Sylvan Meadows again. E-bikes aren't allowed there, and some routes are marked "Hiking Only" on the county map, so check the map symbols before riding a trail you haven't been on.
- The horse. Sylvan Meadows, with the same $2 per-animal fee.
- Out-of-town guests on foot. The Ecological Reserve, where the Moreno and Machado Adobes are.
- A mixed group. Pick the side the most restricted member can use. If a dog is coming, that means Sylvan Meadows.
Why the Reserve Side Keeps Its Rules
The no-dogs, no-bikes, no-horses rule protects some of the most unusual ground in the county. RivCoParks describes the reserve as 9,000 acres with Engelmann oak woodlands, riparian wetlands, bunchgrass prairie and vernal pools. It's home to more than 200 species of native birds and 49 endangered, threatened or rare animal and plant species. One of the two fairy shrimp species in the seasonal pools, the county notes, "is found only here and nowhere else on Earth."
The adobes are the easiest place to take visiting family. RivCoParks calls the Moreno and Machado Adobes the two oldest standing structures in Riverside County. They date to 1846, once served as bunkhouses for cowboys, and sit under a 400-year-old tree with a picnic area between them. Adobe Loop is the trail named for them on the 2026 map.
The county also calls the Plateau's native bunchgrass prairie "the finest example of native grasslands remaining in California." The trail rules on the reserve map open with "Stay on Trail," followed by the bans on dogs, horses and bikes.
Sylvan Meadows Is the Side for Dogs, Bikes and Horses
Sylvan Meadows doesn't have the adobes or the vernal pools. It has its own landmarks, though. RivCoParks points to one of the Plateau's densest stands of rare Engelmann oaks, which grows on a loop trail near the parking area. That loop is short enough to fit before work or before dinner. The higher Manzanita Trail looks back over both the Multi-Use Area and the Ecological Reserve next to it.
Trails there pass through oak woodland, open bunchgrass prairie and chaparral. A historic dirt road from the Plateau's ranching days runs alongside single-track trails. Small bridges cross riparian wetlands that "often flow with streams during winter and spring months." Sylvan Meadows looks different over the year, and the bridges matter most in the coming season.
The Fall Calendar Follows the Same Split
RivCoParks' fall 2026 flyer lists four programs left after September, all under the Santa Rosa Plateau Visitor Center heading. The Nature Education Foundation's Eventbrite listing adds a fifth event at the Visitor Center on Saturday, November 7. The listing doesn't print a year, but November 7 falls on a Saturday in 2026.
- Saturday, October 10, 2:00 to 3:30 p.m. Bike the Meadows.
- Saturday, October 24, 2:00 to 3:00 p.m. Unearthing the Past, a geology program.
- Saturday, November 7, 10 a.m. to 3 p.m. Family Wildlife Day, with birds of prey, live animals and nature activities. Children and youth ages 2 to 17 get in free with an advance ticket, and those tickets are limited.
- Saturday, November 14, 2:00 to 3:30 p.m. Bike the Meadows.
- Saturday, November 21, 2:00 to 3:00 p.m. Unearthing the Past.
Bike the Meadows is the only program on the fall calendar built around bikes. On the Plateau, riding is allowed only in Sylvan Meadows, so call (951) 677-6951 to confirm where the group meets before loading the bikes. The Family Wildlife Day listing on Eventbrite still shows a child-ticket deadline from last year's event, so check with the organizer for this year's date rather than relying on the listing.
Winter Changes Both Sides at Once
Both 2026 maps list the same trail hours: 7:00 a.m. to 6:00 p.m. in summer and 7:00 a.m. to 4:30 p.m. in winter. Neither map gives a date for the switch. The county's main web pages still show only the 6:00 p.m. close. After the switch, the trails close 90 minutes earlier, which makes a late-afternoon dog walk in Sylvan Meadows a lot shorter.
Winter is also when the reserve side is at its most interesting. RivCoParks says the vernal pools draw waterfowl in the colder months, including green-winged teals, Canada geese, grebes, greater yellowlegs and long-billed dowitchers. As the water recedes in spring, yellow goldfields and purple downingia bloom around the edges. Only the protected side has the vernal pools, and the dog has to stay home for that trip.
Rain is the other variable. The California Department of Fish and Wildlife warns that parts of the Santa Rosa Plateau may close from time to time in winter because of flooding. After the heavy rain of January 2024, Valley News reported that the reserve and Sylvan Meadows reopened "weather permitting." The county doesn't publish a rainfall threshold. Its guidance is to "check the website or call the park in advance of their visit to see if there are temporary rules in place."
The Visitor Center schedule is a smaller question. The 2026 trail map lists it as open Tuesday through Saturday, 9:00 a.m. to 4:00 p.m. The county's live page shows the same hours Tuesday through Sunday. If a Sunday visit depends on the Visitor Center, call (951) 677-6951 first.
Clinton Keith Road Is About to Be Repaved
Repaving work is coming to the road that leads to the Plateau. On September 1, the Murrieta City Council voted 4-0 to award R.J. Noble Company a $5,067,921.44 contract to repave about 3.8 miles of road. That includes roughly 1.9 miles of Clinton Keith Road "from the western city limit to Mitchell Avenue" and about 1.9 miles of Jefferson Avenue between Nutmeg Street and Los Alamos Road, Valley News reported on September 17. The city's bid notice describes the work as replacing failed pavement sections, grinding the asphalt, laying a rubberized asphalt overlay, and installing new signal detector loops and striping. The contract runs 85 working days. No start date, work hours or lane-closure plan had been published as of this writing, so leave a little extra time on Clinton Keith once crews show up.
For lunch after the trails, the newest option is Ono Hawaiian BBQ. It opened May 22, 2026, at The Vineyard Shopping Center, 27950 Clinton Keith Road.
Being close to the Plateau, and knowing which side fits a given Saturday, is part of what a Bear Creek address is worth day to day. If you'd like to know what it's worth on paper, Temecula Valley Homes can run the numbers for your home. Request a Free Home Valuation.
