A construction crew is spending this fall beside the visitor center at Aliso and Wood Canyons Wilderness Park. They are building a fossil dig pit, a seating area and a set of hands-on nature exhibits at the Awma Road entrance off Alicia Parkway. It could pass for a standard trailhead upgrade, like a sandbox with a theme. But the ground under Aliso Viejo is ancient sea floor. When crews were grading the hills that later became a golf course here, they uncovered a prehistoric marine mammal skeleton that a museum curator called the best of its kind ever exhibited in North America. So the dig pit points kids at something their own hills have actually produced.
What Is Going In Beside the Visitor Center
OC Parks calls it the Watershed Trail Exhibit Project. OC Public Works is building it in collaboration with OC Parks. According to the August 18, 2026 project notice from OC Parks, the work includes:
- Nature-based educational and interactive exhibits
- A fossil dig pit and seating area
- Regrading of an existing pathway
- Relocation of the park's EV charging station
On June 23, 2026, the Orange County Board of Supervisors awarded the construction contract to KEC Engineering. It runs 60 working days and is valued at $725,742. The project map puts the work right next to the visitor center at the Awma Road entrance.
The construction window runs from August 31 through December 2026. OC Parks says the schedule is tentative and depends on the weather. In practice, plan on the dig pit being finished around the holidays, provided winter rain cooperates.
The Sea Floor Under the Golf Course
Here's the history behind the dig pit. In March 1998, an Orange County paleontological firm, RMW PaleoAssociates of Mission Viejo, was doing a required fossil salvage while hills in Aliso Viejo were being graded. The crew was cutting through diatomite, a pale deposit of ancient sea floor, when they hit bone. What came out was the fossilized skeleton of a Paleoparadoxiid, an extinct four-legged marine mammal that lived 10 to 12 million years ago, when much of California was under water.
Those hills became the golf course at Aliso Viejo Country Club. In 2010, the Orange County Register reported that the skeleton had gone on display in the "Age of Mammals" exhibition at the Natural History Museum of Los Angeles County. The paper described it as the most complete desmostylian skeleton ever found and displayed in North America. Larry Barnes, the museum's curator of vertebrate paleontology, told the Register:
"It's really a keen specimen. No one's ever exhibited this in North America before. No one's got one of these. Ours is the best."
The creek that gives the park its name has a fossil story of its own. In January 2008, the Register reported a baleen whale skull found in Aliso Creek, estimated at 5 to 7 million years old. At the time, officials were keeping the exact location secret while they weighed how to preserve and excavate it.
So a dig pit beside the Aliso Creek watershed is a scaled-down version of something that has really happened in Aliso Viejo.
The Visitor Center Already Tells the First Half
The new exhibits will sit next to a building that already sets up the story. The visitor center opened in May 2021. It's a 2,600-square-foot modular building, partly funded by a $1 million grant from the California Coastal Conservancy. Before it was built, this part of the park had no sewer or water service, and visitors used portable restrooms.
Inside, the OC Parks visitor center page lists:
- A small cave loosely modeled on Dripping Cave
- A full-scale diorama with taxidermy animals, shrubs, trees and grasses
- A hand-painted mural of the park
- Archaeological and paleontological displays
- A topographical map with buttons that light up points of interest and suggested hikes
- A "Stewardship Wall"
OC Parks says many of the exhibits are designed to be child friendly. A wrap-around deck with an observation extension looks out over the canyon. The paleontology displays are indoors. The dig pit adds the outdoor, hands-in-the-dirt version a few steps away. A family can see the displays, step outside to dig, and then walk down the canyon the fossils came out of.
The visitor center keeps shorter hours than the trails. It's open Monday through Friday from 9 a.m. to 3:30 p.m. and Saturday and Sunday from 9 a.m. to 2 p.m. A weekend visit that includes the exhibits works best in the morning.
Getting In While Construction and Rain Season Overlap
The project's last stretch lines up with the start of wet weather, and either one can change your plans. On November 1, at 7:00 a.m., OC Parks posted that Aliso and Wood Canyons was closed because of wet and muddy conditions. The park page warns that trails may stay closed for three days or more after rain.
Here's how the two schedules interact, based on OC Parks' park page and the project notice:
- Weekdays: Crews work Monday through Friday, 7 a.m. to 5 p.m. Trails close while the existing path is being regraded, and intermittent closures can happen so construction vehicles can pass.
- Weekends: OC Parks says trails will be open on weekends during the work. A rain closure still applies on a Saturday or Sunday.
- EV charging: The charger has been unavailable since Monday, October 26, while it's relocated. Parking near it is affected during the relocation and the pathway grading, and "No Parking" signs go up in advance.
- Parking and hours: The park is open from 7 a.m. to sunset, and the parking lot closes at sunset. Enter and exit the Awma Road lot from Alicia Parkway only. Parking is $3 a day, and the machine takes $1 bills, quarters, Visa and Mastercard. Annual passes are sold at the park office. OC Parks suggests calling ahead to make sure staff is available.
Before you load the car, check the OC Parks alerts page. Trail closures post there with a date and time stamp, and a wet-weather notice overrides the weekend-access promise. The park lists its address as 28373 Alicia Parkway in Laguna Niguel.
The park itself is roughly 4,500 acres, with two year-round streams, mature oaks and sycamores, and more than 30 miles of official trails. It's designated a wildlife sanctuary. Even with crews working near the lot, there's a lot of canyon to use.
Where the Fossil Story Meets This Month's Calendar
Ranger-led programs are the easiest way to connect the dig pit's theme to the land around it. The park's events list, reposted on the City of Aliso Viejo's park page, includes a Fitness Hike to Top of the World at Canyon View on Thursday, November 12. It also lists a Jr. Ranger Adventure on Friday, November 13, held at multiple locations. The Jr. Ranger program is the family option, and it's a good pairing with the paleontology displays inside the visitor center. These programs run outdoors, so check the alerts page that morning if it has rained.
The construction window and the city's holiday calendar end at about the same time. The City of Aliso Viejo's All Is Bright Holiday Celebration and Tree Lighting is Thursday, December 3, from 5 to 8 p.m. at Aliso Viejo Town Center. Santa lights a 22-foot tree, and the evening includes train rides, face painting, ornament making, community performances and "magical snowfall." The event is free. If the dig pit is finished by then, the first weekend of December could start with a morning at the canyon, two days after the Town Center tree is lit.
At Aymi Lau, we keep an eye on changes like this one, the small public projects that shape what a weekend near home looks like. If you live near the Awma Road entrance and want to know how improvements like the new exhibits might affect your home's value, or you simply want to talk through what's changing around you, schedule a confidential consultation or request your complimentary home valuation.
