Get Full Government Meeting Transcripts, Videos, & Alerts Forever!
Get email alerts on the I 25 Offramp topic
No spam. Unsubscribe anytime.
Analysis flags I‑25 southbound off‑ramp capacity by 2029–2030 under current growth assumptions
Summary
Staff shared a sensitivity analysis using 2025 counts that projects the I‑25 southbound off‑ramp to Castle Pines Parkway could reach capacity around 2029–2030 under modest growth rates, potentially triggering developer responsibility for widening and requiring CDOT coordination to prevent queueing onto I‑25.
Using fresh 2025 traffic counts and modest traffic growth assumptions, the consultant and staff presented a sensitivity analysis estimating when the I‑25 southbound off‑ramp to eastbound Castle Pines Parkway would reach capacity. "Under current conditions, we're estimating that that ramp might be a capacity in 2029, 2030," the presenter told council. The report modeled queue lengths and noted the safety and operational risk if ramp queues back onto I‑25 — a condition CDOT would not allow and would require signal retiming or capacity changes.
Staff said they shared the analysis with a nearby developer and discussed potential triggers that would obligate widening. Council members asked about funding and whether the developer or CDOT would lead any future widening; staff reiterated that some widening could be developer responsibility and would require interagency coordination.
