Long Term Success of Cedar Tree Revetment Projects in Anoka County

Cedar tree revetments are a cost-effective bioengineering practice that can be used to stabilize actively eroding riverbanks. This spring, staff from the Army Corps of Engineers (USACE) visited several cedar revetment projects that ACD had installed between 2002 and 2016. The two staff from the USACE had been traveling to several states to review what is working and what is not working when it comes to cedar revetment projects. They are hoping to use the information to publish technical notes and/or peer reviewed literature.

They were very impressed by the effectiveness of ACD's revetments, even the very old ones. They attribute this effectiveness to the removal of the back branches. They had not seen this technique in any other state they had visited. Most cedar revetment failures studied, seemed to come from the trees moving/floating during high water and scour behind the trees causing more erosion. They also saw many trees that snapped in half, which was potentially from the stress of so much movement. They are planning to highlight the technique of removing the back branches in any published literature.

Almost all of ACD's revetments visited were still in place. Most had stopped, or greatly decreased erosion at the toe but did not fill in with sediment. The most common failure was broken wire that held the tree to the duckbill anchor. In most of these cases, the trees did not move a lot from where they were originally placed. The breakage seemed to be caused by rust.

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Rum River Cedar Tree Revetments

The Anoka Conservation District has been working hard in partnership with Conservation Corp of MN and the Anoka County Parks Department to implement Cedar Revetments along the Rum River. So far nearly 1,500 linear feet along the Rum has been protected using the bio-engineered practice. These practices have been installed on private lands as well as property managed by Anoka County Parks. This type of practice is effective at protecting the bank from erosion while also enhancing shoreline habitat for wildlife. Cedar revetments are also much less expensive compared to other stabilization techniques. Through a state grant awarded to Anoka County Parks, there is currently funding available to cover 90% of the total project cost.

If you own property on the Rum River and are interested in protecting your shoreline, please contact Kris Larson for more information. 763-434-2030 x110, This email address is being protected from spambots. You need JavaScript enabled to view it..

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Rum River Streambank Stabilization – Grants Available to Landowners

The Anoka County Parks Department recently received a grant to implement conservation practices along the Rum River. Landowners on the Rum have access to funding to address riverbank erosion with a unique method known as cedar tree revetments. Cedar tree revetments are a low cost, but effective, means to address minor to moderate bank erosion before it gets worse and more expensive to fix. The technique involves cable-anchoring cut cedar trees alongside the bank. Cedar tree's dense branches are naturally rot-resistant and can provide many years of bank protection. This armoring technique helps protect property value, improves water quality in the river, and provides quality fish habitat.

Residents interested in having their riverbank evaluated for a cedar tree revetment should contact Kris Larson at the Anoka Conservation District (763-434-2030 ext. 110; This email address is being protected from spambots. You need JavaScript enabled to view it.). Installation of revetments will occur throughout the summer in 2021-2022. Most projects cost $5,000-$10,000. Landowners must provide 10% of the total project cost; the remaining 90% is grant-funded.

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251 Hits