I-5 Colonnade is the first ever urban mountain bike skills park. It’s part of a City of Seattle park, but was funded and constructed by the BBTC (Backcountry Bicycle Trails Club). Limestone Loop is complete and offers a 1/2-mile tight’n’twisty Cross Country loop with several intermediate to advanced…
Discovered this while searching for dog parks. Going to check it out tomorrow early in the morning. Think they might still be raising money… not sure.