Full closure of Alameda Avenue at South Platte River scheduled this weekend

Travel Advisory

May 7, 2024 - Colorado - Southbound I-25 off-ramp also closed

Denver — West Alameda Avenue (CO 26) will be closed for demolition work at the South Platte River Bridge, between Kalamath and Lipan streets, from 8 p.m. Friday, May 10 to 5 a.m. Monday, May 13. The ramp from southbound Interstate 25 to Alameda also will be closed during the same hours.

The closure will allow crews to switch traffic over to the newly constructed northside of the bridge while preparations are made to remove the old south half of the structure. Pedestrians also will be switched to the northside. The South Platte River Trail detour remains in place.

Weekend work also includes:

  • Modifying the barriers to ensure safety of workers and the traveling public
  • Readjusting all pavement markings on Alameda for the new traffic configuration between Kalamath and S. Navajo streets
  • Removing the temporary signal at the southbound I-25 off-ramp and install a new mast arm and pole at the northwest corner of I-25 and Alameda
  • Saw-cutting concrete in preparation for bridge deck removal
  • Removing and then sub-grading all asphalt from west of Lipan to the new bridge approach, in preparation for permanent paving
  • A detour will be in place for motorists and pedestrians. Drivers using the detour below should plan on an extra 20-minutes of travel time. Access to all area businesses will remain open.
Map of closure area and detour route for I-25 and Alameda bridge reconstruction
Map of Alameda Avenue detour routes. Westbound Alameda Detour: North on Santa Fe Drive to 8th Avenue, west on 8th one block to Kalamath Street, south on Kalamath to 6th Avenue Freeway, west on 6th to Federal Boulevard Exit to Federal and then south on Federal to Alameda. Eastbound Alameda Detour: South on Federal to Mississippi Avenue, east on Mississippi to Santa Fe, north on Santa Fe to Alameda.

The Colorado Department of Transportation project, which is replacing the oldest bridge on the state highway system (1911), includes:

  • Constructing a bridge over the South Platte River
  • Building a multi-modal corridor by modifying Alameda intersections including improvements to the I-25 South Santa Fe Drive interchange and eliminating South Platte River Drive between Alameda and Cedar; traffic will be diverted to the widened South Lipan Street north of Alameda
  • Reconstructing the South Platte River Trail with improved sight distance, including a 12-foot concrete trail, a four-foot finely crushed stone trail, and three-foot vegetated shoulders for an overall trail width of 22 feet
  • Constructing an on-street two-way cycle track on the north side of Alameda between South Lipan and South Kalamath street with a connection to the South Platte River Trail
  • Installing a water quality pond
  • Improving sidewalks on both sides of Alameda

Schedule and Travel Impacts

  • Two lanes of the Alameda Bridge, one in each direction, remain open during construction. Motorists should be prepared for narrowed lanes. Access to all area businesses will remain open.
  • Motorists can expect intermittent single-lane and turn-lane closures on South Platte River Drive throughout the project.
  • The South Platte River Trail remains open but detoured around the construction zone.
  • Typical working hours are 7 a.m. to 7 p.m., Monday through Friday.
  • Schedules are subject to change based on weather and available resources. The $22.3 million dollar project is expected to be completed in summer 2025.

Project Information:

Know Before You Go

Travelers are urged to “know before you go.” Gather information about weather forecasts and anticipated travel impacts and current road conditions prior to hitting the road. CDOT resources include:

Remember: Slow For The Cone Zone

The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones. Obey the posted speed limits.
  • Stay Alert! Expect the unexpected.
  • Watch for workers. Drive with caution.
  • Don't change lanes unnecessarily.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.
  • Anticipate lane shifts and merge when directed to do so.
  • Be patient!

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