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Two Harbors, Minnesota

AMI performed topographic and drone surveys to a residential property that was seeing significant erosion to the bluff of the slope due to wave induced erosion and poor slope drainage. Wave and ice forces were calculated using the topographic and local bathymetric data. This data was applied in the design of the armor stone revetments and concrete retaining wall with overhanging deck and stairway. The colored concrete was used to match the existing tones of the bedrock, bluff, and new armor stone. AMI prepared two slope and shoreline stabilization options and completed all Army Corps of Engineers, DNR, Township, Sanitary District and County permitting upon final selection. Final stabilization drawings, construction drawings, and construction estimates for the Owner were provided, along with special inspections during the construction of the armor stone revetment and colored concrete retaining wall. The special inspections included photos to document the construction progress and note any errors to be fixed by the contractor. AMI provided design recommendations along the slope using native vegetation to stabilize the slope from water runoff. Native vegetation recommendations included tree and shrub species were provided for additional privacy barriers as well as added strength to the new slope.


  • House & Guest House Protection
  • Erosion Control
  • Armour Stone Revetments
  • Wave Forces on Deck Analysis
  • Wave Runup & Overtopping Analysis
  • Analysis of Wave & Ice Forces on Armor Stone and Concrete Retaining Wall
  • Private Beach
  • Colored Concrete Retaining Wall
  • Controled Slope Drainage
  • Native Grass Seeding
  • Construction Documents
  • Construction Estimates
  • Final Design for Construction


  • Costal Engineering
  • Marine Civil Engineering
  • Permitting
  • Topographic & Field Surveys
  • Drone Survey & Documentation
  • Special Inspections