Projects

Ballinger Park/Hall Creek Restoration Project

In order to fulfill this component of the Ballinger Park Master Plan in a cost-effective manner, the city approached the Corps of Engineers as a project partner under the Section 206 Continuing Authorities Program.  In the summer of 2018, a project team consisting of Corps and city staff was brought together to uncover any “no-go” obstacles to the project during the feasibility phase.   The feasibility study is now complete – no insurmountable obstacles were found during the investigation.  A preferred creek restoration design has been selected and developed to the 35% design level.  Estimated project costs have been established.  The preferred design was selected using input from the public and from city staff, as well as through extensive analysis by the Army Corps on maximizing project benefit while minimizing project cost.  

PROJECT BENEFITS

  • Removal of old, non-functional tennis court 
  • Creek floodplain reconnection
  • Protection of existing trail and field use
  • Installation of channel diversification (boulders and large wood pieces) 
  • Removal of bank armor
  • Bank restoration 
  • Invasive plant removal
  • Addition of riparian and wetland native plants
  • Addition of overstory and understory native plants around ponds and wetland areas
  • Protection of habitat areas with signage, boardwalks, and fencing
  • Construction of new creek channel with increased habitat potential
  • Installation of pedestrian/maintenance bridge over new creek channel
  • Construction of extensive flyover boardwalk to provide access to park visitors and protect sensitive areas 
  • Formation of hummocks (habitat enhancement)
  • Protection of sight lines for park safety
  • Creation of educational signage targeted to specific audiences (dog walkers, fishermen, kids, etc.)
  • Fulfillment of the environmental protection component of the Ballinger Park Master Plan 

Estimated Cost:  Total project $5,983,000; City of Mountlake Terrace share:  $2,182,000.

Estimated Completion:  Design and engineering:  2021; Construction: 2022.

 

Hall Creek Hydrologic and Hydraulic Analysis

Problem:  Undersized culverts on Hall Creek may be exacerbating flooding issues, but several former pinch points have now been removed.  More information is needed to mitigate downstream impacts resulting from upstream improvements.

Solution:  Analyze the information, and create a model showing what would be needed to address flooding all along the Hall Creek corridor.  Analysis to include review of flows, culvert capacity issues, and the impact of sediment load transport within the system.   

Estimated Cost:  $200,000

Estimated Completion:  2024

 

Hall Creek Flood Abatement Project

Problem:  Ongoing flood risk to property along Hall Creek.

Solution:  Based upon the results of the Hall Creek Hydrologic and Hydraulic Analysis, complete projects to mitigate flood risk, including culvert replacements, off-line stormwater storage, or stormwater pipe reroutes.

Estimated Cost:  $500,000

Estimated Completion:  2026

 

56th Avenue West (Main Street) Stormwater System Upgrades

Problem:  Significant street improvements are scheduled for the 56th Avenue West area.   The age and condition of the stormwater pipe in this area may require numerous relocations, repairs, and replacements.  

Solution:  Stormwater pipes to be evaluated, and repaired, replaced, or relocated during the pavement replacement.

Estimated Cost:  $1,000,000

Estimated Completion:  2023

 

Taylor Pond Rehabilitation 

Problem:  Taylor Pond, located at the corner of 66th Avenue West and 216th Street SW, was constructed in 1980 as a regional detention and water quality facility.   Forty years later, the pond is clogged with excessive sediment and invasive vegetation, reducing the capacity of the pond to store stormwater and improve water quality.  

Solution:  Rehabilitate Taylor Pond by removing accumulated sediment and excessive vegetation; replant native vegetation to return the pond to a fully functioning condition.

Estimated Cost:  $262,000

Estimated Completion:  2023

 

Cedar Way Dam Pond Rehabilitation 

Problem:  The instream pond upstream of the Cedar Way Dam has accumulated significant sediment over time.  This has reduced the pond storage capacity and partially obstructed the outflow.  Pond maintenance access is poor due to vegetation and steep slopes.  

Solution:  Since sediment will naturally continue to accumulate in the pond over time, the addition of an easily-accessible sediment removal area will reduce long-term maintenance costs.  Project includes excavating and removing an estimated 150 cubic yards of sediment from the in-stream pond, providing a rehabilitated maintenance access road, and constructing a sediment diversion area.  

Estimated Cost:  $470,000

Estimated Completion:  2023

Ballinger Park Hall Creek project