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AnimalsI-25 near Castle Rock, between Larkspur and Monument

A wildlife overpass cut I-25 animal collisions by 91 percent

In the 10 months since the Greenland crossing opened near Castle Rock, drivers hit two animals on a stretch that used to see about one collision a day.

Verified · Source: The Colorado SunOct 14, 2026 · 1 min read
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A vegetated wildlife bridge crossing a highway, with no people on the span
A wildlife overpass on Colorado State Highway 9. This is not the Greenland crossing on I-25. Jeffrey Beall / Wikimedia Commons · CC BY 4.0

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The reporting lives at The Colorado Sun. Our summary is checked against it, and we link it on every story.

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In the 10 months since the Greenland wildlife crossing opened on I-25 near Castle Rock, drivers have hit two animals on a stretch that used to average about one collision a day. That is a 91 percent drop. Pronghorn crossed I-25 on the overpass for the first time in decades.

Six more crossings are being designed. The count is collisions, not a claim that every animal in the corridor now uses the bridge.

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