ACD Partnering with City of Anoka for Mississippi Riverbank Stabilization

Approximately 1,500 linear feet of eroding riverbank within Mississippi River Community Park in Anoka will be stabilized in 2021. The project is currently in the early stages of design and focuses on a stretch of severely eroding riverbank that was documented in an erosion inventory completed by ACD.

Eroding river banks contribute to the Mississippi River's sediment and turbidity impairments through direct loading of sediment and nutrients that degrade overall water quality as well as aquatic and nearshore habitat. Stabilization of actively eroding riverbanks is one of the most cost-effective practices to improve water quality because 100% of the sediment reaches the waterway.

Stabilization techniques will include bioengineering with native vegetation and a rock armored bottom of slope to stabilize the riverbank. The project will reduce pollutants by 529 tons of sediment and 847 pounds of phosphorus annually. Other benefits include aquatic life diversity and abundance, and improved drinking water quality because the project site is immediately upstream of drinking water intakes for the Twin Cities.

This project will also showcase river stewardship and enhance public recreation. Mississippi River Community Park and adjacent Anoka-owned King's Island include 1.7 miles of Mississippi River trail, 0.78 miles of riverfront, 0.91 miles of oxbow channel, pedestrian access to the island, sporting fields, public duck and deer hunting, and a fishing dock. This project will make over ¼ mile of unsafe riverbank more accessible, stable, and fishable for users. By naturalizing the riparian zone, this project complements the Mississippi River Corridor Critical Area rules.

The project is funded by a Clean Water Fund grant, a Watershed Based Funding grant, and match from the City of Anoka. Watch for more updates from ACD and the City of Anoka as the project progresses.

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Riverbanks, Lakeshores, and Rain Gardens, Oh My! - It's Been a Busy Spring

Anoka Conservation District staff have had a busy spring providing technical assistance to landowners for projects related to water resources. Inquiries about riverbanks, lakeshores, and rain gardens have been particularly common. In total, technical assistance has been provided to over 40 individual property landowners.

Active erosion is the primary reason that prompts people to reach out for assistance with their riverbanks and lakeshores. ACD staff have expertise in a wide variety of stabilization methods and know what it takes to complete a successful project. For example, stabilization projects typically require a formal design and coordination with a qualified contractor for installation. There are also a number of permits commonly required, which ACD staff have experience coordinating. Thus far in 2020, technical assistance has been provided for 13 riverbanks and 12 lakeshores.

Technical assistance has also been provided for 16 rain gardens so far in 2020. Rain gardens are generally categorized as either rooftop disconnect or curb-cut. Rooftop disconnect rain gardens receive runoff from downspouts. Driveway runoff could also be directed to rooftop disconnect rain gardens via a trench drain.Rooftop disconnect rain gardens can be a great do-it-yourself project. Curb-cut rain gardens direct water from the curb and gutter system into a shallow depression in your yard near the road and are primarily constructed by landscape contractors. Once the rain garden fills (typically 1' deep), the runoff bypasses the inlet so there is no risk of flooding your yard. This allows the 'first flush' to be treated, which typically has the most pollutants.

Available funding can be limited, but it's always a good idea to check because new grants may become available from year to year. If funding is unavailable, ACD staff can minimally provide technical assistance. That process typically begins with a phone call or email to learn about the site. ACD staff then conduct a desktop site assessment using available mapping data and schedule site visits when necessary. ACD will also provide assistance with design and construction management, which are sometimes covered by grants.

If you have questions about your property, please contact us. In addition to assistance with projects related to water resources, ACD staff are also available to assist with habitat restoration projects. 

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