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County Line Road / I-25 Operational Improvements

Phase 2B Construction (Information courtesy of the City of Lone Tree)

  • One of the southbound and westbound turn lanes will be fully closed for the construction of the new lane. Intermittent single-lane closures will occur on the off-ramp from 9 a.m. to 3:30 p.m.

Map of upcoming ramp closures and detours for County Line / I-25 road improvements

This is a City of Lone Tree Project – please contact Lisa Albers (Lisa.Albers@cityoflonetree.com )at City of Lone Tree.

Phase 3 Construction – Regarding the east side of I-25 improvements to County Line Road, the design team continues to refine the traffic modeling and tweak the preliminary design in order to maximize the traffic operational benefits of the proposed improvements, which will combine the two closely spaced intersection into a more traditional four-legged intersection.  The next steps before completion of the final design involves resolving utility conflicts, acquiring additional survey information, potholing existing utilities, and significant right-of-way acquisition.  Staff is working to find a solution to resolve water quality requirements.  The design team hopes to advance the final design far enough along by end of 2018 so that we can begin to relocate utilities in the second quarter of 2019, and allowing construction to begin in March 2020.

For more information about the Phase 2B and Phase 3 improvements please contact Art Griffith, Douglas County Engineering, at agriffit@douglas.co.us or 303-660-7490.