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112th Ditch Updates & Workshop

Flood threats and damage can be stressful, and this has been a record-wet year in our region. The City of Northglenn has heard your concerns related to the drainage system along 112th Avenue from Washington Street to the RTD North Metro Commuter Rail Line. We want to better understand the problem and continue to hear your input.

See the map with resident comments here. 

Next Steps:

Mile High Flood District (MHFD) is actively conducting a comprehensive study to understand the flooding issues in this area. This study, currently underway, will be done in time to implement potential improvements and protective measures prior to the start of the next flood season. This study will consider both interim and long-term solutions.

In January 2024 staff met with Mile High Flood District and Wright Water Engineers to review the hydrologic modeling of the 112th ditch area watershed and hydraulic analysis of the piping and ditch capacities. Interim protective measures will be discussed with the goal of identifying measures that can be implemented prior to the spring rain and runoff season. These measures will be items that can be implemented within current staffing and budget constraints.

We will continue to refine the options for more permanent solutions and present those to City Council in the 1st quarter of 2024. These recommendations will come with cost estimates. This information will also be shared with residents at another public engagement meeting, 6:30 p.m. on Tuesday, March 5 at the Northglenn Recreation Center. This engagement meeting will then lead the team to determine the preferred action(s), so that we can identify funding options and start developing construction plans.

Your feedback and observations are also valuable to this process, and we want to hear more. The City and MHFD’s team held a public engagement meeting 6:30 p.m., Thurs., Nov. 16 at the Northglenn Rec Center. The meeting provided an update on the study’s findings and schedule and was a venue for hearing from individual property owners to further understand what you have observed and experienced on your property.

As we continue to refine our options and timeframes, we will continue to provide email updates and update this page.

If there is information you feel the engineers working on this study need , please email hgeyer@northglenn.org or pacre@northglenn.org

Jan. 19 Update

City staff continues to monitor previously conducted maintenance and repairs. The project team met on-site this past week to walk the corridor and continue vetting the constructability of interim protection measures. Several solutions were solidified, while others were eliminated due to concerns with additional negative impacts. All the options are intended to be used as a part of any permanent solutions to reduce the 'throw-away' costs of any work conducted. Mile High Flood District will be talking with contractors over the next several weeks to get additional costing information and perspectives on construction. We anticipate being able to construct the interim measures late spring.   

Jan. 5 Update

For the 112th Ditch and Roadway Project, no new or additional maintenance activities have taken place this past week. Staff met with Mile Hight Flood District staff and Wright Water Engineering to review preliminary recommendations. The team will continue to work through these preliminary recommendations this month, specifically vetting the constructability of interim solutions as well as permanent solutions. The team will do a site walk within the next week as part of the vetting of preliminary recommendations. Once this work is done, recommendations will be brought forward to City Council and the public for input and feedback.

Dec. 8 Update

No new or additional maintenance activities have taken place this past week. The additional survey information gathered has allowed Wright Water Engineers to almost complete the hydrologic modeling of the 112th ditch area watershed. The hydraulic analysis of the piping and ditch capacities will be the next area of their focus. There are still on track for the study.

Nov. 17 Update

  • MHFD and the City hosted a ditch workshop last night. A special thank you to those of you who were able to attend the workshop. We appreciate your time and feedback. The MHFD team documented feedback and that will inform the preliminary recommendations for the study. If you were not able to attend, and want to provide input, please reach out to me and I’ll connect you with MHFD. We will reach out about a future meeting once we have preliminary recommendations, costs associated with improvements, timelines and share this information with you to receive your feedback. This will be in early 2024. We are on schedule to receive preliminary recommendations in mid-December.  
  • As shared last week, bank stabilization and ditch maintenance are complete. MHFD and the City remain committed to maintaining the ditch in 2024 and beyond to ensure the full capacity of the ditch once spring weather arrives.

112th

Nov. 10 Update
  • The bank stabilization work between Irma and the N Line has been completed. Ditch maintenance and repair work is complete.
  • The MHFD study of the area continues to progress as expected. The study continues to be on schedule. A reminder about the upcoming 112th Ditch workshop scheduled for Nov. 16 – postcard below. If this date does not work for you, please reach out to me and we will get another time scheduled for you to meet with MHFD. The postcards were mailed on Monday 10/30.
Nov. 3 Update
  • The contractor has completed the bank repair and stabilization with rock and soil in the severely eroded areas between Irma and the FasTracks line. They are completing the installation of erosion control materials in the disturbed bank areas and will be seeding those areas with native grasses and wildflower seed mix for stabilization. The cold and snow delayed the completion, but they hope to have everything wrapped up mid next week.
  • The MHFD study of the area continues to progress as expected. MHFD’s surveying consultant has substantially completed the collection of utility information and additional survey data along the ditch and storm sewer network. This survey information will be used to analyze the hydraulics of the ditch and storm sewer system. The study continues to be on schedule.
  • A reminder about the upcoming 112th Ditch workshop scheduled for Nov. 16 – postcard below. If this date does not work for you, please reach out to Heather and we will get another time scheduled for you to meet with MHFD. The postcards were mailed on Monday 10/30. 
If you have any questions, please reach out to City Manager Geyer at 303-450-8706 or hgeyer@northglenn.org.
 
Oct. 27 Update

  • Mile High Flood District’s (MHFD) contractor has completed the sediment removal between Washington and Irma. They are currently installing erosion control materials in the disturbed bank areas and will be seeding those areas with native grasses and wildflower seed mix for stabilization.
  • The contractor is continuing the bank repair and stabilization with rock and soil in the severely eroded areas between Irma and the FasTracks line. These locations will also have seed and erosion blanket installed. They hope to have everything wrapped up early next week.
  • The MHFD study of the area continues to progress as expected. Preliminary hydrology results were discussed with the team and are continuing to be refined. MHFD’s surveying consultant is continuing to collect utility information and additional survey data along the ditch and storm sewer network. This survey information will be used to analyze the hydraulics of the ditch and storm sewer system. The study continues to be on schedule.
  • A reminder about the upcoming 112th Ditch workshop scheduled for Nov. 16 – postcard below. If this date does not work for you, please reach out to Heather and we will get another time scheduled for you to meet with MHFD. The postcards will be mailed on Monday 10/30.

Oct. 19 Update

  • Mile High Flood District’s (MHFD) contractor has completed the vegetation removal within the ditch. Their crews will continue working on removing sediment and cutting a low-flow pilot channel throughout the corridor. They will also be repairing some severely eroded embankment segments with soil riprap to prevent further migration of the ditch embankments towards the northern properties. They anticipate completing this work within the next two weeks as we have added some additional areas to the original scope of work with the contractor. The contractor started work on Tuesday and they are making good progress.
  • The MHFD study with WWE is progressing as expected. The project team will be meeting next week to discuss the preliminary results of the hydrology component of the study. Over the next three weeks, the residents might notice MHFD’s surveying consult along E. 112th Ave. They will be collecting utility information and survey data along the ditch and storm sewer network. This survey information will be used to analyze the hydraulics of the ditch and storm sewer system. The MHFD team is committed to advancing this study as quickly as possible, and they are currently tracking on schedule.
  • A reminder about the upcoming 112th Ditch workshop scheduled for Nov. 16 (postcard below). If this date does not work for you, please reach out to me and we’ll get another time scheduled for you to meet with MHFD. Previously I indicated that postcards would be mailed out this week, the postcards will be mailed to your homes late next week.

Oct. 12 Update

  • Mile High Flood District (MHFD) contractor cut and removed the vegetation (that had regrown) from Washington to the FasTracks line. The crew used pickup trucks and small trailers to access the area via the sidewalk.
  • MHFD contractor will start the sediment removal work within the next two weeks. They again are planning to use small equipment and access the areas via the sidewalk or Larson Glenn Park. They will use the flat areas on either side of the intersections (north side at Washington, Larson, Irma) for minor materials staging.
  • No lane closures occurred this week. We are not anticipating any for the sediment removal/restoration work, but we also need to make sure the crews are safe. Valles may need to have a ‘rolling closure’ much like MacDonald Farms did for the pea gravel removal. It would not be long term, would go up when they start work and come down when they leave for the day.
  • Community Workshop logistics are set. See the postcard below. We will mail out postcard early next week and push information out via social media. Residents in the immediate vicinity of the roadway and ditch will receive a postcard. The workshop will be held Nov. 16 at the Northglenn Recreation Center beginning at 6:30 p.m. This is an interactive workshop format with no formal presentation. If you are unable to attend the meeting, please reach out to me and we will coordinate a time for you to meet with the MHFD team to provide input. The City did try to secure a neighborhood school for the workshop, and they did not have space for us.  

Thank you for your continued input on this important issue. The City is committed to the safety and well-being of its residents and to finding the best solution for this neighborhood.