Castle Rock's new I-25 ramps open soon
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Atop Crystal Valley Interchange's bridge in mid-May, looking north. Photo: Robert Sanchez/Axios
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.
What they're saying: "This isn't a Band-Aid," Ross Stanley, Castle Rock's project manager, tells Axios. "This is huge for the town, and we're not going to see something like this again."
Fun fact: Stanley says the interchange's bridge has a signature paint color — "CVI Brown" — a custom Sherwin-Williams shade.
My thought bubble: Driving east just to head south off I-25 adds nearly 15 minutes to visits with my sister-in-law and her husband in south Castle Rock.
The bottom line: After decades of waiting, southern Castle Rock is finally opening its front door to I-25.