Construction is set to take place in October along 630-feet of eroding Rum Riverbank at Dellwood River Park in St. Francis. Erosion of the riverbank is causing numerous trees to fall into the river and is threatening a popular local walking trail. The project design features three primary protection measures;

• 1)Two severely eroding zones of riverbank encroaching on the trail will be built back out, armored with rock riprap, and have large tree rootwads added as in-stream habitat elements. The riprapped length of bank will total approximately 180-feet in length. Large boulders will be strategically placed within the riprap to allow enhanced shore fishing opportunity.
• 2)Three bendway weirs constructed of rock will protrude at 45° into the river. These low-lying, linear features will be submerged under the water (except during very low flows), and will push flow and erosive scour back toward the middle of the channel, rather than along the outer bank. They will also add variable flow areas and habitat value in the channel. These will be great features to cast around for any fisher folks from shore!
• 3)And finally, the less severely eroding areas of riverbank will be armored with anchored cut cedar trees in a technique called a "cedar tree revetment". Cut eastern red cedars will be cabled together in a shingled fashion along the bank and secured with earth anchors driven into the soil. This is a softer armoring approach than rock which should help the bank stabilize, vegetate, and heal over time naturally before the cedar trees eventually rot away.

For more information contact Jared Wagner, Water Resource Specialist, This email address is being protected from spambots. You need JavaScript enabled to view it. 

ACD recently exhibited at the 2023 Low Impact Development (LID) Conference held in Oklahoma City. The 2023 LID Conference had 250 registrants from 40 states. Jared Wagner, with the ACD office made the trip south, and had constructive interactions with folks working all across the country. Many organizations were already familiar with ACD's products but were interested for more information. Some groups did not know that ACD offers a variety of products that are designed to serve specific needs. The Foxhole product was particularly intriguing to folks in search of a solution for bioretention and pretreatment under sidewalks. The annual conference was well organized and a great way to meet and learn from professionals in other states who are dealing with the same types of environmental problems we face here in Minnesota.

For more information contact Jared Wagner, Water Resource Specialist, This email address is being protected from spambots. You need JavaScript enabled to view it. 

A design has been finalized to stabilize 650-feet of eroding Rum Riverbank at Dellwood River Park in St. Francis. Erosion of the riverbank is causing numerous trees to fall into the river and is threatening a popular walking trail. The project design, currently in the permitting phase, features three primary protection measures;

• 1) Two severely eroding zones of riverbank encroaching on the trail will be built back out, armored with rock riprap, and potentially have large tree root-wads added to provide in-stream habitat elements. The riprapped length of bank will total approximately 180-feet in length.
• 2) Three bendway weirs constructed of rock will protrude at a 45° into the river. These low-lying, linear features will be submerged under the water, and will push flow and erosive scour back toward the middle of the channel, rather than along the outer bank. The bendway weirs will also add variable flow areas and habitat value in the channel. These will be great features to cast around for any fisher folks from shore!
• 3) And finally, the less severe eroding areas of riverbank will be armored with cedar trees in a technique called a "cedar tree revetment". Cut eastern red cedars will be cabled together in a shingled fashion along the bank and secured with earth anchors driven into the soil. This is a bioengineering approach that is softer and less expensive than rock which should help the bank stabilize, vegetate, and stabilize over time before the cedar trees eventually rot away.

For more information contact Jared Wagner at 763.434.2030 ext.200 or This email address is being protected from spambots. You need JavaScript enabled to view it..

LiDAR stands for Light Detection and Ranging. The landscape is mapped by laser pulses projected from a low-flying airplane. These pulses bounce back to a sensor which records the location of the airplane, the angle of the pulse, and the time it takes the light to bounce back. Using that information, the system is able to create a point cloud of the landscape. This point cloud is then converted into modeled surface of the ground called a Digital Elevation Model (DEM). This model can be used to map terrain features like water flow paths and drainage areas, geologic features, infrastructure, and many others.

The first generation of LiDAR data in Minnesota was collected from 2008-2012. Since then, the landscape has changed in untold ways, and technology has dramatically improved for collecting more dense and accurate data. Because of this, the 3D Geomatics Committee of the State's Geospatial Advisory Council set out to coordinate the collection of Generation 2 LiDAR in Minnesota. This effort is currently underway in partnership with the USGS as the lead data collection entity nationally, and counties and other local partners as the ultimate data recipients. Generation 2 LiDAR data collection started in 2021. Anoka County data was collected in 2022, and will be available in 2023.

This new data will allow us to map watercourses, drainage areas, and floodways in much higher resolution and with more accurate and recent data from the landscape. We'll also be able to assess eroding slopes like those along riverbanks for height, steepness, and stability without having to traverse them with survey gear. Because the new data is so robust, it is also opening up possibilities for forestry and vegetation surveys, very detailed mapping of infrastructure, and untold uses yet to be implemented or even thought of.

For more information about this incredibly useful public data, visit the Minnesota LiDAR Hub online at: https://lidarhub-minnesota.hub.arcgis.com/