Padden Creek 24th to 30th Streets Restoration Project

Project Overview: EN055 & EN058

Padden Creek 24th-30th Street Restoration Project is a multi-phased project to address impaired conditions. The goals of this project are to improve water quality and aquatic functions in Padden Creek through enhancing floodplain, instream, and riparian functions between 24th and 30th Streets.

Summary of Padden Creek 24th to 30th Streets Restoration Project Phase 1. Posted February 2023.

The project is divided into three phases. Phase 1 was constructed in 2022 and is located in the center of the reach, roughly between Padden Creek’s confluence with Connelly Creek upstream to the Happy Valley Park footbridge. Phase 1 enhanced the floodplain as well as instream, off-channel, and riparian buffer structure and function. Phase 2 is the downstream section, running from the Connelly Creek confluence down to 24th Street. Phases 2 and 3 include stream relocation and buffer restoration.

Project Status (Phase 2) – December 2023

Construction of Phase 1 wrapped up in early 2023. We are currently in the process of designing Phase 2. We anticipate awarding a construction contract in spring 2024, with construction planned for summer 2024.

Anticipated Construction Impacts

Access to the sidewalk along Old Fairhaven Parkway and directly next to the project will likely be restricted at times due to construction.

More Information

Functional floodplains, off-channel habitats, and riparian buffers are important aspects of functional watersheds. Unfortunately, many of these features are often missing or reduced along urban streams. This is the case for Padden Creek, where these features have been impacted by urban development and stream channelization, exacerbating the water quality problems in Padden Creek.

Padden Creek is on Washington State’s 303(d) list of water quality-impaired waters for dissolved oxygen, temperature, and fecal coliform. Padden Creek also has a Total Maximum Daily Load (TMDL) for temperature (Hood & Cristea 2011). Padden Creek contains ESA-listed Chinook salmon and steelhead trout, and according to Washington State water quality standards, the 7-day average of daily maximum temperatures in Padden Creek should not exceed the core summer salmonid threshold of 16 degrees Celsius. However, long-term monitoring by the City has shown that point-in-time summer water temperatures have exceeded this threshold.

Since 2014, the City has invested more than $9.5 million in the Padden Creek corridor through the Padden Creek Daylighting Project, Padden Estuary Restoration, and the Harris Street Stormwater Treatment Facility. Phase 1 will complement more recent WSDOT fish passage improvements in Padden Creek at I-5 and Fairhaven Parkway.

Phase 1 was completed in early 2023 and included the center section of the project reach between 24th and 30th Streets.

Phase 1 focused on restoring Padden Creek at its confluence with Connelly Creek. The Phase 1 project area was an undeveloped floodplain owned by the City and connected to private undeveloped land to the north, creating one of the widest remaining undeveloped riparian corridors in the lower Padden sub-watershed.

Phase 1:

Restored and enhanced approximately two acres of riparian buffers with native vegetation, including approximately 1.25 acres of wetland and approximately 1.6 acres of floodplain.
Enhanced approximately 550 linear feet of stream channel with pools, riffles, fish-friendly sediment, backwaters, and side channels.
Installed approximately 12 large woody debris structures.

Phase 1 restored and enhanced approximately two acres of riparian buffers through the removal of invasive species and the installation of native plant species. The enhanced buffers will create shade over time, help filter fecal bacteria and stormwater pollutants, and provide a source of woody debris for stream structure and function.

Phase 1 will also improve aquatic function through the formation of pools and riffles, the creation of side channels and backwaters, the addition of large woody debris, and the enhancement of some of the last remaining riparian wetlands in the watershed.

Floodplain enhancement included maximizing floodplain extent and increasing the connectivity between groundwater and surface water. Increased connectivity will stabilize stream temperature by minimizing baseflow attenuations. Wetland enhancement will decrease stream temperatures through groundwater recharge and the stabilization of baseflow. Large woody debris will decrease stream temperatures through enhanced hyporheic exchange, improving the vertical connectivity between groundwater and surface water. Phase 1 actions that decrease stream temperature will also increase dissolved oxygen, as they are inversely related. Phase 1 also directly increases dissolved oxygen levels through the creation of riffles.

Contract awarded – May 23, 2022
Contract amount – $254,858.02
Contractor – Matia Contractors, Inc.
Vicinity Map

This project is funded by the City of Bellingham, Washington State Department of Ecology, U.S. Environmental Protection Agency, and Washington State Recreation and Conservation Office.