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BETTESWORTHConstruction

High Line Canal Underpass at Yale Avenue Opens After a Year of Construction

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The High Line Canal Trail underpass beneath East Yale Avenue, just west of South Holly Street in Denver, was completed in October 2026. It gives people walking and biking a route beneath Yale Avenue rather than across its vehicle traffic at street level; construction began in September 2025.

What does the new underpass change for trail users?

The underpass carries the High Line Canal Trail beneath East Yale Avenue, removing the need for trail users to cross Yale at street level at this location. Denver describes the project as a safer and more convenient crossing for people walking and biking. That is the project’s stated purpose; available project reporting does not provide a measured before-and-after crash reduction.

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The project is at Yale Avenue just west of South Holly Street. Its completion is a milestone for the crossing, but it is not the end of all improvements planned for the nearby Yale and Holly intersection.

How was the underpass built, and where are its trail connections?

The construction includes a concrete box culvert beneath Yale Avenue, retaining walls, and graded concrete connections to the trail. Denver says the trail connection meets the main High Line Canal Trail about 500 feet north and south of the underpass.

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That layout matters when approaching from the neighborhood: someone on the at-grade sidewalk just west of the Canal follows the trail connection until it meets the main trail, then continues to an underpass approach. The tunnel is not a direct entrance from every adjacent street. Denver’s project page describes the construction and access connections.

How much did the project cost?

Denver’s current estimate for combined design and construction is $23.9 million. The city lists an estimated $17.3 million for the underpass component and $6.6 million for Yale Avenue roadway improvements. These are estimates, not a final audited cost.

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Denver lists $3.7 million in Elevate Denver funding and $11.5 million from other Denver, DRCOG, and Arapahoe County funds. Those listed sources total less than the combined project estimate, so they should not be read as a complete accounting of how the full budget is funded. The figures and project scope are on Denver’s official project page.

What work is still planned at Yale and Holly?

The underpass is Phase 1, led by Denver. A separate Phase 2, led by Arapahoe County, addresses the main intersection and paths leading to the new underpass. The county schedules that work to begin in spring 2027 and finish in fall 2027, so people should not assume all nearby intersection and path improvements are complete just because the underpass has opened.

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Denver and Arapahoe County have worked together on safety improvements at Yale and Holly since 2014, according to the county. See the county’s Phase 2 project information for the separate schedule and scope.

How does the crossing fit into the High Line Canal Trail?

The High Line Canal Conservancy describes the Canal as a 71-mile trail used for walking, nature viewing, bicycling, hiking, horseback riding, and picnicking. The Yale underpass is one local infrastructure improvement along that longer route, designed to separate trail users from traffic at a roadway crossing. The Conservancy lists the Canal’s trail improvements and uses.

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The Denver Gazette reported the project’s ribbon-cutting on October 27, 2026, after construction that started in September 2025. Its report provides the completion context; the city and county project pages provide the respective scopes and estimates.

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Frequently Asked Questions

Is the Yale Avenue underpass open to both walkers and cyclists?

The crossing is part of the High Line Canal Trail and is intended for people walking and biking. The project reporting does not specify additional operating restrictions or hours.

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Does finishing the underpass mean the Yale and Holly intersection project is finished?

No. The underpass is Denver-led Phase 1. Arapahoe County’s separate Phase 2 covers the main intersection and connecting paths, with work scheduled in 2027.

How long is the High Line Canal Trail?

The High Line Canal Conservancy describes it as a 71-mile trail. It lists activities including nature viewing and horseback riding as well as walking and bicycling.

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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply. Prices as of November 13, 2026 8:21 am GMT+0000.

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