The I-25 “Gap” construction project, the monthslong effort to improve safety and mobility between Castle Rock and Colorado Springs, was scheduled to reach a new milestone by the end of December.

Two wildlife underpasses and the improved interchange at Greenland Road opened Dec. 22, according to a news release from Douglas County officials.

Crews had been working for the past 18 months on improvements to the Greenland Road interchange, which had originally been installed circa 1948, according to the release. The interchange is now a two-lane underpass, the highway widening as it approaches the interchange.

“With the bridge complete, traffic will be shifted into its final alignment on I-25,” the release states.

The first of the two new wildlife underpasses is located south of the Greenland Road interchange. The second is located just north of the County Line Road bridge.