Bainbridge Island’s new mountain bike park trails will be color-coded just like if they were winter ski slopes — black for advanced, blue for intermediate and green for beginner.

The Strawberry Hill Bike Park plan will be presented to the BI Metro Parks & Recreation board at 6 p.m. Dec. 15 at the BI Recreation Center. BI mountain bikers have worked with Seattle-based Evergreen for months to craft a park for riders of all skill levels on approximately 8 acres.

The bike park will have a series of downhill trails color-rated by degree of difficulty with several dedicated uphill paths to chug their way back to the top. Earthen jumps, rollers and berms will challenge riders flying downhill, with special open, skill-building areas and platforms at top and bottom.

Key to the proposed design is a series of “flyovers,” wooden overpasses that allow downhill riders to cross above others where two trails intersect. Serving both safety and space, the flyovers let the designers eke out 1.5 miles of trails on the parcel. “I would say it’s a small bike park, but the flyovers allow us to utilize the whole terrain,” said Matt Blossom, who has been involved in the project. “It’s a great stepping stone for riders who are wanting to get in and progress to bigger regional parks.”

An anonymous donor last year gave $1 million to the BI Parks & Trails Foundation to purchase the 10-acre former strawberry farm for a bike park, expanded dog park and conservation. The foundation expects to begin fundraising for Strawberry Hill Bike Park early in the new year, as designs and costs are finalized.

Bike park development dovetails with the park district’s healthy forests initiative. Volunteers have spent months grubbing bushels of invasives like holly and ivy off the property. This winter, hundreds of weak and underperforming trees will be felled and areas replanted. The park district is also looking at a broader revamp of Strawberry Hill Park, with improved lighting and turf for sports fields, and other new features like an expanded skatepark.

“One of the great things about the bike park project, and this is true of the skatepark plan too, is just how central it is to so many people on the island,” said Mary Meier, foundation executive director. “Strawberry Hill Park is close to Winslow neighborhoods, the main school campus is just up the road, and kids are going to have an easy time getting here after school to ride.”

Blossom said only two trails will be fully machine-built, with the rest relying on hand labor. Volunteers may also help with the post-and-beam work on flyovers and other features. See the preliminary plans at www.biparksfoundation.org/bikepark.

Evergreen Mountain Bike Alliance’s West Sound chapter has a growing portfolio of some 70 miles of public mountain bike trails, from regional facilities like the new Port Gamble mountain bike park to Heritage Forest near Silverdale and Port Orchard’s Banner Forest. Blossom said Evergreen will be expanding its “trails schools” (mountain bike education programs) here. “This is going to provide something I wish I would have had as a youth on Bainbridge, giving kids the opportunity to get out and recreate with their friends in a safe manner and a clean manner,” Blossom said.

Mountain biker Eli Glosser looks forward to the toughest features. “It’s a thrill when you get into the more advanced stuff. I like going fast,” he said. “I enjoy stuff that’s a little more advanced, but obviously, it’s designed to be more family-friendly.”