Highway ReconstructionErosion ControlWaterway Protection
Highway 22 Reconstruction
Mankato to St. Peter
Protecting a Sensitive Corridor — From the Minnesota River to the Road Ahead
Service · Quality · Integrity
A $37 million corridor reconstruction. Sensitive and impaired waterways. A one-year build window with traffic moving throughout. Ero-Guard supplied the erosion control system that kept slopes stable, sediment out of the Minnesota River, and the project on schedule.
The reconstruction of Highway 22 from Mankato to St. Peter addressed critical intersections, upgraded aging pavement, and laid the groundwork for a future Minnesota State Trail connection — all while navigating environmental sensitivities along one of the region’s most ecologically significant corridors. Ero-Guard supplied $260,000 in erosion control blankets, hydro-mulch, and custom seed blends engineered to stabilize slopes, capture runoff, and accelerate vegetation growth across a complex, multi-phase project site.
$37M
Total project reconstruction value
$260K
Ero-Guard erosion control materials supplied
2 yr
Multi-phase build — 2024 preliminary through 2026 completion
3
Product categories supplied: blankets, hydro-mulch, custom seed
The Project
One of Minnesota’s Busiest Corridors. Rebuilt from the Ground Up.
Highway 22 between Mankato and St. Peter carries significant regional traffic load — residents, freight, and through-travelers — making reconstruction both operationally complex and environmentally high-stakes. The project scope was sweeping: a new “Continuous T” intersection at Co. Rd. 57 (N Riverfront Drive), added acceleration lanes, improved sight distances, a roundabout at Hill Street (Le Sueur County Road 21) in Kasota, bridge repairs and replacements, enhanced intersection lighting, snow fence installation, and foundation work for a future multi-use trail linking Mankato and St. Peter.
Preliminary work began in 2024 with minimal traffic disruption. Primary reconstruction ran through 2025–2026, during which Highway 22 traffic was detoured strategically to maintain public access throughout the build. Consulting engineers at Bolton & Menk of Mankato set the environmental and technical standards the project team was required to meet — standards that placed significant demands on every erosion control product specified for the job.
The Challenge
Impaired Waterways, Active Traffic, and No Room for Sediment.
The Highway 22 corridor runs adjacent to sensitive and impaired waterways, including the Minnesota River — a regulated resource where sediment migration from active construction sites carries serious regulatory and ecological consequences. MnDOT and Bolton & Menk required erosion control systems that could perform immediately, hold through heavy rainfall events, and protect downstream water quality without requiring repeated corrective intervention.
Grading and embankment work exposed soils across extended stretches of the corridor, creating vulnerable slope surfaces at risk of erosion, rilling, and runoff during Minnesota’s intense summer storm season. Construction sequencing and active traffic detours compressed work windows, limiting the time available to stabilize freshly graded areas before the next weather event arrived.
The Solution
A Full-System Approach — Blankets, Mulch, and Custom Seed Working Together
Ero-Guard supplied an integrated erosion control package engineered for the specific demands of the Highway 22 corridor — not an off-the-shelf product selection, but a system of complementary materials designed to work together from initial slope exposure through long-term vegetation establishment.
Erosion Control Blankets
Ero-Guard blankets were installed across exposed embankments and slope faces to provide immediate surface protection. The blanket system held soils in place through heavy rainfall, prevented rill formation, and created the stable microenvironment necessary for seed germination and early root development.
Hydro-Mulch
Hydraulically applied mulch provided rapid, flexible coverage on slopes and disturbed areas where blanket installation was impractical. The hydro-mulch system bonded to the soil surface, reduced erosive forces from rainfall impact, and retained moisture to support seed germination in the compressed construction timeline.
Custom Seed Blends
Seed blends were engineered specifically for the site’s soil conditions, slope exposures, and MnDOT specification requirements. Custom blending ensured species compatibility with the corridor’s ecological context — including the Minnesota River adjacency — and maximized the speed and uniformity of vegetative establishment across the project area.
Ero-Guard’s contributions turned a routine reconstruction into a high-performance infrastructure project — where innovative environmental solutions and technical expertise delivered tangible benefits for communities, agencies, and the surrounding ecosystem.
— Highway 22 Project Summary
The Results
Slopes Held. Waterways Protected. Project Delivered on Schedule.
Across a two-year build window that included summer storm seasons, active traffic management, and proximity to impaired waterways, Ero-Guard’s erosion control system performed without failure. Each product category contributed to an outcome where environmental compliance and construction momentum reinforced rather than competed with each other.
Slope Stability
Slopes remained secure under heavy rainfall throughout the construction season. No significant erosion events, rill formation, or slope failures were recorded across the project corridor.
Waterway Protection
Runoff was captured and redirected before reaching the Minnesota River and other sensitive waterways. The project met all MnDOT and MPCA water quality requirements without corrective action or compliance interruptions.
Vegetation Establishment
Newly established vegetation thrived across treated slopes, creating long-term environmental and operational resilience. Custom seed blends performed to specification, with uniform cover reducing long-term maintenance demands on the corridor.
Schedule Continuity
Proactive erosion control eliminated the need for reactive repairs or stop-work events. Site continuity was maintained throughout both the 2024 preliminary phase and the 2025–2026 primary reconstruction, keeping the project on track for delivery.
Today, Highway 22 supports safer travel for residents, more efficient freight movement, and a corridor prepared for future active transportation. The multi-use trail foundation is in place. The roundabout at Kasota is operational. And the Minnesota River runs cleaner for it.
Specifying for a MnDOT or State Highway Project?
Whether you’re stabilizing embankments along an active corridor, protecting impaired waterways, or sourcing MnDOT-compliant blankets, hydro-mulch, and custom seed for a complex infrastructure project — Ero-Guard has the products and the expertise to deliver.
About Ero-Guard Erosion Control Products
Founded in 2004, Ero-Guard manufactures a full line of erosion control blankets and straw wattles from its Midwest facility. Products are NTPEP-evaluated and listed on 20+ state DOT approved product lists, making Ero-Guard a trusted specification choice for transportation, infrastructure, and environmental projects across the region. Pillars: Service. Quality. Integrity.
A Nexterra Environmental Company
Ero-Guard is part of the Nexterra Environmental platform — a multi-regional distributor and manufacturer of erosion control and stormwater management solutions, serving infrastructure, energy, commercial, municipal, and residential markets across the Midwest and Southeast.