Northbound ramps at the Crystal Valley interchange are set to open soon, giving southern Castle Rock its long-awaited direct connection to Interstate 25.
Why it matters: The interchange will relieve traffic pressure in a rapidly expanding area, and it’s a major step for Castle Rock’s commercial and residential growth.
State of play: The northbound on-and off-ramps will open in phases this summer, though the exact opening date hasn’t been set.
- Southbound ramps are expected to open with the completed interchange in summer 2027.
The big picture: Town officials describe the interchange as critical infrastructure for a massive new residential and commercial hub on Castle Rock’s southern edge.
- Dawson Trails, a mixed-use master-planned development west of I-25, calls for about 5,850 homes and more than 3 million square feet of commercial space across about 2,000 acres.
- Buildout is forecast to take about two decades.
- Imminent plans for the area include Costco and a King Soopers. A medical campus and additional retail are also expected as developers aim to turn open prairie into a major new commercial hub.
Yes, but: For now, the interchange will provide needed relief for existing developments east of I-25.
- As is, residents in neighborhoods like Crystal Valley Ranch must drive several miles north on smaller roads to access I-25. Many drivers funnel through already-congested Plum Creek Parkway.
- Some rely on two-lane Lake Gulch Road farther east.
Follow the money: The interchange carries roughly a $144 million price tag, making it Castle Rock’s most expensive transportation project ever.
- Funding comes from Castle Rock transportation funds, Douglas County, the Denver Regional Council of Governments, a federal BUILD grant and developer-backed financing tied to Dawson Trails.
Flashback: The Crystal Valley Interchange has been planned since the 1980s, when southern Castle Rock was still largely undeveloped and planners anticipated growth from Plum Creek south toward Larkspur…