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Colorado's Crystal Valley Interchange in Castle Rock Opens Nov. 14; $150 Million Project Finished Eight Months Early

Saturday, November 14, 2026 · States · GSM News

The Crystal Valley interchange on Interstate 25 in Castle Rock, Colorado, opened its southbound on- and off-ramps over the weekend of Nov. 14-15, bringing the full interchange into service. The project cost about $150 million, was completed within budget, and finished eight months ahead of schedule. The interchange is located at Exit 179 on Interstate 25, connecting the Crystal Valley and Dawson Trails communities, and serves as the entrance to the Crystal Valley business district. The northbound ramps opened earlier this year, and traffic at the nearby Plum Creek interchange has fallen by about half since then.

Project funding included $53.6 million from developers, $24 million from Douglas County for the interchange and $11 million for a west-side frontage road, plus an $8.9 million grant from the Denver Regional Council of Governments and a $5.4 million federal Department of Transportation BUILD grant. Douglas County's population has grown nearly 24 percent over the past decade, the main reason for building the interchange. The town said the interchange will make it easier for residents to reach newly approved facilities including Costco, King Soopers supermarket, and HCA HealthONE hospital.

Published by GSM · USA (original Chinese edition)

Photo: 图:卡斯尔罗克附近的25号州际公路(资料图),水晶谷立交位于该路179号出口。来源:Wikimedia Commons,CC BY-SA 4.0。 / Photo: Interstate 25 near Castle Rock (file photo); the Crystal Valley interchange is at Exit 179 on this highway. Source: Wikimedia Commons, CC BY-SA 4.0.

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