Restoring tidal marsh and migration pathways for wildlife

FRESH news from the mud and marsh

The Fraser River drains a watershed that covers one-quarter of British Columbia into a vast estuary that creates a beautiful and challenging environment for field scientists.

“I’m in mud for most of my day,” says Taylor Marriott, DUC conservation programs specialist and a crew member for the last two years. “There’s no shade on the mudflats so you have to prepare for a long day in the sun with the right gear. You quickly learn that you can’t set equipment down because the fine sediment and salt get into everything. Your phone, your bags.”

Following is an update on the three projects restoring habitat for salmon in the imperilled ecosystems in the Fraser River Estuary:

North Arm Jetty Breaches

Marriott works with FRESH Restoration Projects field crews to monitor fish species associated with the projects and to document vegetation and sediments, as well as benthic communities, which are the wildlife found on the water bottom.

Marriott’s crew monitored fish species on either side of a breach installed in 2022 in the North Arm Jetty by Raincoast Conservation Foundation. The jetty is a 6.8-kilometre barrier constructed in 1916 parallel to the coastline, which cuts off the North Arm of the river from the estuary.

Juvenile salmon can use the breach as an off-ramp from the fast-flowing river into the semi-saline tidal marsh, sand flat and mudflat habitats of Sturgeon Bank before striking out into the Salish Sea. Two additional breaches are scheduled for 2023 and 2024.

Supported by:

• Raincoast Conservation Foundation
• Ducks Unlimited Canada
• Fisheries and Oceans Canada
• Province of British Columbia
• Pacific Salmon Foundation

Sturgeon Bank Sediment Enhancement Pilot Project

Many steps were needed to prepare a bold pilot project to restore tidal marsh in the Sturgeon Bank Wildlife Management Area. Currently, nearly two million cubic metres of sediment are dredged every year from the Fraser River and taken by ship out to sea. Some of that vital material is now being repurposed for habitat restoration, instead.

“Let’s take that sediment and hook it up to a temporary floating sediment-delivery pipeline on Southern Lulu Island,” Balke said. “As we’re releasing those fine sediments in a slurry of water during the flood tide, we’re directing those sediments toward the shoreline where we want marsh to grow.”

The project is scheduled for launch in late 2022. Success will help rebuild salmon habitat locally and, more broadly, demonstrate a method for large-scale restoration which could help tidal ecosystems survive where sea-level rise threatens to drown marsh habitat.

Supported by:

• Ducks Unlimited Canada
• Fisheries and Oceans Canada
• Province of British Columbia
• Tsawwassen First Nation
• Vancouver Fraser Port Authority

Alaksen National Wildlife Area Tidal Marsh Restoration

Plans are underway for tidal marsh restoration to re-establish 21 hectares (51.8 acres) of foraging habitat for juvenile salmon to improve their body condition before the growing fish enter the open sea.

Crews working at Alaksen National Wildlife Area completed invasive cattail management this year. Many of DUC’s conservation projects include the expense and disturbance of invasive species removal at the outset.

Supported by:

• Ducks Unlimited Canada
• Tsawwassen First Nation
• Environment and Climate Change Canada
• Fisheries and Oceans Canada
• Province of British Columbia

Learn more:

Read about the Fraser River Estuary jetties from our FRESH Restoration Projects partner: Another jetty, another breach project: Raincoast has begun a new connectivity restoration project on the North Arm

Learn how this project is synergistic with Metro Vancouver’s upgrade of the Iona Island Waste Water Treatment Plant and proposed ecological restorations: Iona Island Wastewater Treatment Plant Projects – Conceptual Design (Metro Vancouver)

About the FRESH Restoration Projects

The Fraser River Estuary Salmon Habitat (FRESH) partnership includes DUC, Raincoast Conservation Foundation, Tsawwassen First Nation and Lower Fraser Fisheries Alliance. Funding is provided by the British Columbia Salmon Restoration and Innovation Fund through Fisheries and Oceans Canada and the Province of British Columbia, with additional funding from Tsawwassen First Nation and the Vancouver Fraser Port Authority.