Lower Coal Creek Flood Hazard Reduction

Aerial photo of Coal Creek and Newport ShoresThe King County Flood Control District has provided funding to the City of Bellevue to address flooding issues in the Newport Shores neighborhood. The city is working with an engineering team and in conjunction with Newport Shores residents to develop a project with two components to reduce flood risks. The first component will reduce Lower Coal Creek flooding and the second will reduce street flooding.

Schedule of Activities

The Lower Coal Creek flood reduction effort will aim to follow this schedule:

  • Group 1 – Upper Skagit Key Culvert Replacement (complete)
    • 2015-2017 - Design, easement and permit acquisition (complete)
    • 2017 – Construction (culvert replacement) (complete)
  • Group 2 – Cascade Key and Newport Key Culvert Replacements
    • 2017-2018 - Design, easement and permit acquisition for new bridges (complete)
    • 2018 and first few months of 2019 – Construction of culvert replacements
  • Group 3 – Glacier Key and lower Skagit Key Culvert Replacements; potentially Newport Yacht Club and Grand Canal outfalls
    • 2017-2019 - Design, easement and permit acquisition (under way)
    • 2019 and first few months of 2020 – Construction of culvert replacements and Newport Yacht Club and Grand Canal outfalls if permits and easements are obtained       
             

Reduce Creek Flooding

Lower Coal Creek outfalls and bridgesLower Coal Creek outfalls and bridgesUpdated May 2018
To reduce the risk of flooding from Lower Coal Creek and to better allow for fish passage, the City of Bellevue will replace culverts with new bridges at the five creek crossings in the neighborhood.

Construction of Bridges in 2018
This summer, the City of Bellevue will construct new bridges at Cascade Key and Newport Key to improve the flow of water in Coal Creek and decrease the risk of debris getting stuck and causing flooding. Bellevue will provide the contractor with the Notice to Proceed on May 29. Construction crews will start work 1-2 weeks after this date.

Newport Key Bridge
The construction of the new bridge at Newport Key will require closing the street to vehicles and pedestrians at Coal Creek between Skagit Key and Orcas Key from approximately June through October 2018. While the road is expected to reopen in October, the construction will likely continue through December 2018. The residents living on Newport Key will have access to their driveways and garbage collection throughout the construction period. The new bridge at Newport Key will look very similar to the bridge recently constructed on Skagit Key.

Cascade Key Bridge
The construction of the new bridge at Cascade Key will take place from June through December 2018. From June through October, Cascade Key will be reduced to one lane near Coal Creek. The single lane will be 11-feet wide and will be able to accommodate pedestrians, cars, garbage trucks, and delivery trucks. While school is in session, there will be flaggers during peak hours to help control the flow of traffic. During other times, there will be a temporary traffic light with a sensor that switches to green when vehicles are waiting and switches to red, both directions, if pedestrians need to cross the construction area. All residents on Cascade Key will continue to have access to their driveways and garbage collection throughout the construction period, aside from up to six short-duration (2-hour) full closures of Cascade Key throughout the summer of 2018. During these full-closures, the road may be opened every 20 minutes if vehicles need to pass. The new bridge at Cascade Key will look very similar to the bridge recently constructed on Skagit Key, except it will be constructed at the same level as the existing road (not raised).

Noise and Construction Equipment
Drill rigs will be required to construct the bridges at Cascade Key and Newport Key. There will be elevated noise during the week(s) when drilling and demolition take place. The City of Bellevue will provide advance notice to residents about elevated noise levels by asking the Newport Yacht Club to send emails out to affected residents. Bellevue will use non-vibratory equipment when possible; however, the area’s poor soils means that vibrations can travel easily through the ground.

During the week (Monday through Friday), construction crews are permitted to work from 7:30 a.m. to 4:00 p.m. Construction is allowed to take place on Saturdays after 9 a.m. if needed; notice will be provided to adjacent residents when Saturday work is scheduled.

The contractor will work to minimize the impacts and inconveniences of storing construction equipment that is not actively in use. Construction areas that are not part of the open roadway will be fenced off at the end of each work day and through the weekend. Please note that construction crews will bring in rigs during the early morning so they won’t hold up traffic, but they will not begin working before 7:30 a.m.

The Construction Inspector, Brian James, will be on site every day and can be reached at 206-423-9451 or bjames@bellevuewa.gov if residents have any questions or concerns.

Impacts to Trees and Landscaping
Building the new bridges at Cascade Key and Newport Key will require cutting down several trees. The City of Bellevue will plant new landscaping after the construction is complete and will provide maintenance for a short period of time on the new vegetation.

Project Monitoring
After the bridges are constructed, there is the potential for the asphalt to settle into the ground due to the area’s poor soils. If settlement occurs, the City will come back and grind and overlay a section of pavement. An analysis showed this was the most cost-effective solution to the possibility of settlement. If residents notice that the asphalt has settled more than a ½ inch at the bridges’ edges, please contact Debbie Harris, Project Manager at DHarris@bellevuewa.gov or 425-452-4367.

Reduce Street Flooding

Street flooding in Newport Shores

Updated May 2018: To alleviate roadway flooding in the Newport Shores community, the City of Bellevue has proposed to relocate stormwater outfalls from Coal Creek to Lake Washington. The existing outfalls to Coal Creek are the “drains” for roadway stormwater. During the City’s analysis of the flooding in the community, it found that when there are heavy rains or big storms, Coal Creek fills up with water. This causes the roadway drains to back up because the stormwater has nowhere to go. When the water backs up onto the roads, it brings the dirty stormwater from Coal Creek onto the roads and leaves behind creek sediment in the roadway after the stormwater recedes.

The proposed outfalls would be at the Newport Yacht Club and Grand Canal. The City of Bellevue is working with the Newport Shores Homeowners Association (HOA) and property owners along the Grand Canal to acquire the easements necessary to relocate the outfalls. The construction of outfalls is on hold until easements are acquired. The construction of bridges, which is underway, will provide some reduction of roadway flooding, but the combination of the two projects together will make a significant difference in flooding and complete the project as intended.
 

Public Outreach

Community meetingThe City of Bellevue is committed to working with residents throughout the design, permitting and construction phases of this effort. Below are public outreach activities for spring and early summer 2018:

  • Send letters and a Frequently Asked Questions (FAQ) document regarding road closures to residents on Cascade Key, Newport Key, Columbia Key, Crescent Key and Decatur Key.
  • Hold evening meetings with property owners who live next to the construction sites.
  • Set up an informational booth in the Newport Yacht Club to answer questions from all residents.
  • Send out an email notice to all residents regarding the road closure and anticipated construction schedule.
  • Publish an article in the Newport Shores newsletter regarding the road closure and anticipated construction schedule.
  • Quarterly updates to the Lower Coal Creek Flood Hazard Reduction webpage.

Previous Public Outreach:

  • In December 2017 the project team made a presentation to the NYC HOA Board about the Lower Coal Creek Flood Hazard project. The purpose of the meeting was to educate new Board Members on the scope of the project, the goals of the project and the current status of the project.
  • In November 2017, the City held a community meeting to hear from residents about their experiences during the construction of the bridge at upper Skagit Key. The City wanted to learn how to best mitigate construction impacts in summer 2018 when it constructs new bridges at Cascade Key and Newport Key. Please see the November 15, 2017 community meeting summary and map exercise of preferred communication methods.
  • In September 2017, the city gave a presentation to Newport Shores residents regarding the proposed project to build a new stormwater outfall at the Newport Yacht Club. View the presentation, fact sheet, and design package from this meeting.
  • In May 2017, residents living near the upper Skagit Key bridge met with city staff to discuss the upcoming bridge replacement project. They learned about potential construction impacts and the steps Bellevue is taking to reduce construction-related nuisances over the summer.
  • In May 2016, nearly 40 Newport Shores residents attended an open house to learn about, provide feedback on, and ask questions about the Lower Coal Creek Flood Hazard Reduction Project and other infrastructure efforts in Newport Shores.
  • In May 2014, the city hosted a public forum at the Newport Yacht Club to hear the public’s thoughts on potential alternatives.
  • In March 2014, the city had a meeting with the Newport Yacht Club Association.
  • In October 2013, the city had a meeting with the Newport Yacht Club Association.
  • In April 2013, the city hosted a booth at the its Spring Forward Expo.

Other public outreach activities are being planned for future stages of the project. This will include updates to this webpage, updates in the Newport Yacht Club Association’s newsletter, as well as future community forums and potential field trips.

Project History

Below is an overview of the history of the Lower Coal Creek flood reduction effort.

Winter and Spring 2018 Completion of the designs for the new bridges at Cascade Key and Newport Key (Group 2); communication with the Newport Yacht Club HOA and property owners near the proposed Grand Canal outfall regarding obtaining easements.  
Fall 2017  Completion of construction of the new bridge at upper Skagit Key; start 90% design of Group 2 and work with property owners near the Cascade Key and Newport Key culverts; communicate with the Newport Yacht Club HOA and property owners near the proposed Grand Canal outfall regarding obtaining easements.
Summer 2017 Construction of the upper Skagit Key bridge. Begin design of the bridges at Cascade Key and Newport Key and the Grand Canal outfall (Group 2 projects).
Spring 2017 Finalization of “100% plan and design” document for the Upper Skagit Key bridge.
Winter 2016 Finalization of the “60% plan and design” document for Upper Skagit Key bridge.
Fall 2016 Finalization of the “30% plan and design” document for five culvert replacements.
Summer 2016 Submittal of Army Corps of Engineers permit and completion of the draft “30% plan and design” document.
Fall 2015 / Spring 2016 Preliminary bridge design.
Summer/Fall 2015 Contracting and field investigations.
Winter/Spring 2015 Selection of engineering design team.
2014 Select preferred alternative(s); finalize pre-design and details of preferred alternative(s); community meeting to discuss preferred alternatives.
Winter/Spring 2014 Alternatives analysis, public involvement.
Fall/Winter 2013 Engineering study of existing conditions; initial contact with public.

How can I stay informed?

This webpage offers the most up-to-date information on the project. Additional materials and project information will be posted on the site as the project develops. For more information, please contact:

Debbie Harris, Project Manager
425-452-4367
DHarris@bellevuewa.gov

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