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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 1: Construction completed June 2019

Phase 2: Construction beginning in 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 2/20/20


Status: Despite the continued unsettled weather, crews are making great progress. The main storm pipeline is now to the east side of the alley between Curtis and Champa. Inlet work is underway, and curb / gutter—from Arapahoe to Curtis—will begin next week. Because of some rescheduling with subcontractors, the water line service work and resulting water service interruption is now set for mid-next week—depending on weather. All affected residents will be notified 24 hours in advance. 

Impacts: Watch for the upcoming partial closure of the Champa / 27th intersection (one southbound lane) as crews start staging for the work moving east. Once the Curtis intersection is paved and open, that partial closure of Champa will become a full closure. We anticipate the opening of Curtis and the full closure of Champa to take effect the week of March 2, depending on weather. Until then, work is still underway within the initial closure area: 27th Street is closed between Arapahoe and Champa, and the intersection of 27th and Curtis is fully closed. Northbound traffic is being detoured to Arapahoe, and southbound traffic is detoured to Champa. 

Parking: “Resident Parking Only” signs are in place in half-block segments—from 26th to 28th—along Curtis, Arapahoe and Champa. Please be respectful of those signs and the designated ADA accessible parking spots. These signs are in place for residents living along the construction zone who depend on them.  All of these designated parking spots will be removed from these areas and moved along with the work as it progresses east at the end of the month.

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
Denver Public Works
303 446 3706



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.