Steep Slope Rehabilitation

Steep Slope Rehabilitation

The Puget Sound and Straight of Juan de Fuca contain around 1,400 miles of coast, much of that comprised of high bank waterfront. Further inland, our many streams, rivers and slopped terrain contain even more miles of steep slopes and high banks. Through the complex workings of logging and clearing, development, stormwater and vegetation maintenance, we often see slope destabilization and disrepair.  Our expert staff recognizes indicators for surficial slope failure and can remediate, slow or abate these processes in certain circumstances.

Steep Slope Rehabilitation involves a 3 part process:

Design:

Evaluate current conditions and cause of erosion or land loss, come up with a plan and design.

Installation:

Carry out the plan and design in a safe manner with limited disturbance to the area.

Maintenance:

Maintain healthy vegetation and proper drainage to prevent future erosion problems.

Here are 3 examples of Steep Slope Restoration jobs we completed:

Sequim Bay

Marine High Bank Rehabilitation

This shoreline restoration project in the Sequim Bay area involved a thorough slope assessment to identify any issues with the slope that we could help with. Our assessment indicated invasive plant species presence, sparse vegetation, signs of improper stormwater management causing erosion, and areas of erosion that could be amended by natural stabilization techniques (waddles, live staking, plant installation, coir fabric to reduce wind erosion).

We determined that we could assist by removing the monoculture of English ivy that had taken over the slope and by installing native plants at the crest of the slope and along terraces of the slope itself. We manually removed the ivy, followed up with herbicide application, and then coir erosion fabric was installed along the slope crest and face. Native plants were installed at the top and any bare ground was covered with mulch to reduce erosion and limit the return of the ivy. Willow live stakes and waddles were installed along the slope face to jump start native regrowth and help with stabilization.

The site also had two tight lines that were degraded to the point of leaking mid slope, which causes erosion. We replaced those with ones that fully extend to the shoreline and outlet at areas that will not negatively impact slope health.

If you are experiencing shoreline erosion at your property or need to remove noxious weeds, call or email us today to discuss how we can help restore your property using science-based restoration and management methods.

Discovery Bay

Marine Shoreline Erosion Control

This video collage is compiled from a marine shoreline restoration and steep-slope stabilization project in Blyn Washington. Our crew installed coir erosion fabric, erosion logs and many native plants into the slope. This design intends to inhibit future sediment erosion, strengthen the slope’s soil cohesion, and jump start a healthy native plant community.

This planting design consisted of native bare root plants, small plant tubes and plugs, and live-stakes from our private nursery in Sequim.

“We could not be happier with the results of the landscaping installation. Thanks again for your assistance with this project. We will be in touch for additional consultation once the remodel has been completed.”

Tom M. of Poulsbo – Private home owner – February 2017.

Port Angeles Waterfront

Marine High Bank Plant Restoration

Following tree removal on a shoreline in Port Angeles, Peninsula Environmental installed over 1,000 native low growing trees, shrubs and herbaceous herbs and grasses on this shoreline steep slope. Plants were chosen for their suitability in a nearshore environment, tolerance to salt, sun and wind, and ability to establish in hardened clay soils. This installation aided in reducing slope instability after tree removal.

shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization

The install crew maneuvered along the slope using climbing ropes to minimize damage and erosion while installing the plants. Plants were of many sizes, including 10-cubic inch plugs, 4-inch plugs, bare-roots and 1-gallons. All of our planting techniques and plant selections are using best available science on the subject of slope stabilization.

shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization

Long-term vegetation management within view corridors, while maintaining slope stability and controlling erosion, are important considerations in steep slopes on the Strait of Juan de Fuca and the Puget Sound. We aim to minimize long-term maintenance need, reducing tree and shrub pruning, through installation of plants that both inhibit slope issues and allow homeowners to reclaim lost views.

shoreline-slope-stabilization
shoreline-slope-stabilization
shoreline-slope-stabilization

Call today, or fill out the form below to start your project