Existing Conditions Assessment I-25 Central Planning and Environmental Linkages (PEL) Study 2829 W. Howard Pl. Denver, CO 80204 [email protected] i25centralpel.codot.us This page intentionally left blank. Existing Conditions Assessment Contents Introduction .......................................................................................................................................... 1 Study Location and Description ........................................................................................................ 1 Public and Stakeholder Engagement ............................................................................................... 3 Feedback Received To-Date ...................................................................................................... 5 Transportation Planning Context ....................................................................................................... 7 The History of I-25 Central ............................................................................................................... 7 Existing Land Use Context ............................................................................................................... 7 Section 1: 20th Street to Colfax Avenue ..................................................................................... 8 Section 2: Colfax Avenue to US 6/6th Avenue ............................................................................ 8 Section 3: US 6/6th Avenue to Santa Fe Drive/US 85 .............................................................. 11 Previous Planning Efforts and Studies ........................................................................................... 13 Summary of I-25 Relevant Previous CDOT Studies ................................................................. 14 Summary of I-25 Relevant Previous Denver Studies ................................................................ 18 Planned Developments (Private) .................................................................................................... 23 Burnham Yards ........................................................................................................................ 23 Denver Water Campus ............................................................................................................. 23 Highlands ................................................................................................................................. 23 Stadium Redevelopment .......................................................................................................... 25 STEAM on the Platte ................................................................................................................ 25 Sun Valley EcoDistrict .............................................................................................................. 25 Ongoing and Future Studies .......................................................................................................... 25 Central Platte Valley-Auraria District of the Downtown Area Plan ............................................. 26 Colfax Corridor Connections .................................................................................................... 26 Denver Moves: Downtown........................................................................................................ 26 Denver Moves: Pedestrians & Trails ........................................................................................ 26 Denver Moves: Transit Plan ..................................................................................................... 27 Denver Urban Waterways Restoration Study ........................................................................... 27 Denver 2017 General Obligation Bond—Elevate Denver ......................................................... 27 Opportunities ................................................................................................................................. 28 (1) Speer Boulevard to Colfax Avenue—East side of I-25 ........................................................ 28 (2) Colfax Avenue to US 6/6th Avenue—West side of I-25 (Sun Valley) ................................... 28 (3) Colfax Avenue to Santa Fe Drive/US 85—West side of I-25 ............................................... 28 (4) Additional Opportunities for Connectivity ............................................................................. 28 Existing Roadway Overview ............................................................................................................. 31 I-25 Mainline, Cross Streets, and Interchanges .............................................................................. 31 I-25 and 20th Street Interchange .............................................................................................. 32 I-25 Mainline Between 20th Street and Speer Boulevard ......................................................... 33 Highlands Pedestrian Bridge (16th Street) Over I-25 ................................................................ 34 15th Street Over I-25 ................................................................................................................ 34 I-25 and Speer Boulevard Interchange ..................................................................................... 35 April 2019 i Existing Conditions Assessment I-25 Mainline Between Speer Boulevard and 23rd Avenue ....................................................... 36 I-25 and 23rd Avenue Interchange ........................................................................................... 37 I-25 Mainline Between 23rd Avenue and 17th Avenue ............................................................. 38 I-25 and 17th Avenue Interchange ........................................................................................... 39 I-25 Mainline Between 17th Avenue and Colfax Avenue, Auraria Parkway, and Walnut Street ...................................................................................................................... 40 I-25 and Colfax Avenue, Auraria Parkway, and Walnut Street Interchange .............................. 41 I-25 Mainline Between Colfax Avenue, Auraria Parkway, and Walnut Street and 8th Avenue ............................................................................................................................... 43 13th Avenue and RTD W Line Under I-25 ................................................................................ 43 I-25 and 8th Avenue Interchange ............................................................................................. 44 I-25 Mainline Between 8th Avenue and US 6/6th Avenue ........................................................ 45 I-25 and US 6/6th Avenue Interchange .................................................................................... 46 I-25 Mainline Between US 6/6th Avenue and Alameda Avenue ............................................... 47 BNSF Railway Under I-25 ........................................................................................................ 48 I-25 and Alameda Avenue Interchange .................................................................................... 49 I-25 Mainline Between Alameda Avenue and Santa Fe Drive/US 85 ........................................ 50 I-25 and Santa Fe Drive/US 85 Interchange ............................................................................. 51 Engineering ........................................................................................................................................ 53 Roadway Geometrics ..................................................................................................................... 53 Lane Widths ............................................................................................................................. 53 Shoulder Widths ....................................................................................................................... 53 Horizontal Alignment ................................................................................................................ 54 Horizontal Stopping Sight Distance .......................................................................................... 54 Cross Slope ............................................................................................................................. 54 Acceleration/Deceleration Distance .......................................................................................... 54 Ramp Spacing .......................................................................................................................... 55 Lane Balance and Route Continuity ......................................................................................... 55 Ramp Departure Angle ............................................................................................................. 55 Vertical Alignment .................................................................................................................... 55 Clear Zone ............................................................................................................................... 55 Pavement Condition ................................................................................................................. 62 Structures .....................................................................................................................................