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27th Street Storm System

The 27th Street Storm Interceptor Project will improve public infrastructure and safety, relieving drainage and flooding issues in Five Points, the Curtis Park neighborhood and the RiNo Art District. 

Phase 1 


Phase 2 


Phase 3 


In addition to providing flood relief in the immediate area, the new, enlarged 27th Street stormwater system will work in concert with stormwater systems along 33rd and 36th Streets to provide greater flood protection to the larger area.

When all construction phases are complete, the stormwater improvements will include:

  • An upsized, underground drainage system to convey stormwater from Five Points to the South Platte River
  • New and upgraded storm inlets to allow larger volumes of stormwater to enter the storm drainage system faster and more efficiently
  • Reconstruction and repaving as well as new ADA-compliant curb ramps for the streets impacted by construction
Project Status: Phase 2 Construction Underway

The 27th Street Storm Drain is one of several large diameter storm drain projects that the City and County of Denver has identified to improve public safety by relieving drainage and flooding issues in the Curtis Park and Five Points neighborhoods. The 27th Street Storm Drain project includes approximately 5,900 linear feet of large storm pipe ranging in size from 78 inches to 96 inches in diameter.

Phase 1: Construction was completed in Summer 2019

Phase 2: Construction started in early January 2020, expected to last through Fall 2020

Phase 3: Design

Council District: 9

Neighborhoods: Curtis Park, Five Points
RiNO Art District 


Phase 2 — Construction Update 5/20/20


Status: The intersection of Champa and 27th is now open to traffic, and the final layer of pavement will be completed when all of the water line work is completed in Champa—this will likely happen mid to late June.  The paving on 27th Street from Curtis up to the intersection of Champa is complete, and it’s a beautiful sight. The water line work at Stout was completed quickly this morning. Inlet and concrete work at Champa is finishing up. Pipe is in place in 27th up to the west side of the Stout and 27th intersection, and once the shoring is in place past Stout, the push to lay pipe up to California will begin. To move to California as quickly as possible, crews will be working Saturdays and longer hours starting next Tuesday, after the long weekend. There will be no work this coming Friday or Monday.

Impacts: The Stout intersection is now closed. Heads up: There may be additional water line work at the Champa intersection during the first week of June that will require some closures. We will keep you updated on that situation. There will also be more asphalt coming in mid-June, from Champa to Stout. 

Parking: “Resident Parking Only” signs are in place in half-block segments—from 26th to 28th—along Champa, Stout and California. Please be respectful of those signs and the designated ADA accessible parking spots, as they are in place for residents living along the construction zone who depend on them. 

UPDATED COVID-19 INFORMATION: We are still working with a few supplier delays caused by the COVID-19 situation. Crews continue to abide by all of the recommendations from health officials. Stay at home policies for sick employees, social distancing practices, wearing masks, and hand-sanitizing stations for the crew are all continuing.

map of 27th Street closures from Arapahoe Street intersection to Champa Street intersection 


27th Street will be closed to traffic in sections up to two blocks at a time, between Arapahoe and California Streets. Traffic will be detoured onto adjacent streets as needed, but residential, business and pedestrian access will be maintained via secondary access points or through the construction zone.

Existing water lines and sanitary sewer lines will need to be relocated to accommodate the new storm sewer pipe.  Businesses and residences along 27th Street (between Arapahoe and California Streets) will have temporary water and sewer disruptions to complete the relocation work. Advance notice will be provided to those who will be impacted.

Storm drainage systems are far beneath the surface of city streets, and thus require shoring of the excavation sites to ensure the safety of the workers below. There are many types and methods of shoring that have been used on previous stormwater projects — some of these methods are more invasive than others. Sheet piling and beam and lagging shoring systems are examples of shoring methods that are more invasive. Slide rail and trench boxes are examples of the less invasive shoring systems. 

This phase of the 27th St. Storm Interceptor project is far less complicated than Phase 1, thus it is likely that the contractor will be using minimally invasive shoring methods combining the use of slide rail systems and trench boxes. We do not anticipate that the contractor will need to use sheet piling or beam and lagging to complete this project, and therefore we do not anticipate any vibration issues on Phase 2.

There will be a monitoring system in place, similar to what was in place on Phase 1. Anyone with questions or concerns about vibration issues can contact the CCD project manager, Aaron McMichael, to resolve the issue.

The 27th Street Storm Interceptor project is one of several large-diameter storm drain projects to relieve drainage and flooding issues in the Five Points and Curtis Park neighborhoods and the RiNo Art District. Currently in this area, stormwater runoff drains to the South Platte River at the over-burdened 36th Street Outfall, leading to flooding during storms. When complete, the new storm drain system will connect to an existing 108-inch storm drain at Coors Field Parking Garage at Blake Street, balancing water flow between multiple systems and resulting in less flooding along the 27th and Washington Street corridors.

Phase 3 and additional future phases of the project are still in design, but the alignment is expected to run from the end of Phase 2 down California Street to 26th Ave, southeast along 26th Ave to Washington Street and continue south down Washington Street toward 20th Ave. These future phases are still seeking funding approval. 

The 27th Street Storm Drain project was first identified in the 2005 Stormwater Master Plan. This project is a high priority focus stormwater basin and was included in the 2016-2021 Six-Year Capital Improvement program


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Hotline: 303-834-3588
Call or text the project hotline; get weekly updates, leave a voicemail or text with questions or concerns.

Text: 27THST to 31996 to receive text updates during construction.

City and County of Denver

Aaron McMichael, Project Manager



Concrete Works of Colorado
Mark Almond, Project Manager
303-665-2933, ext. 118


Phase 1 Archive

Phase 1 construction began at the Coors Field Parking Garage in October 2018 and continued upstream (eastward) along 27th Street to Arapahoe. This phase was completed in June 2019. 


Phase 3 Planning

Phase 3 and additional future phases of the project are still in design, but the alignment is expected to run from the end of Phase 2 down California Street to 26th Ave, southeast along 26th Ave to Washington Street and continue south down Washington Street toward 20th Ave. These future phases are still seeking funding approval.