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MnDOT outlines multiyear improvements on Highways 75 and 30, including concrete overlays and culvert replacements
Summary
MnDOT District staff described programmed projects in Pipesaukee County: unbonded concrete overlays on Highway 75 (2026, 2029), a mill-and-overlay on Highway 30 with culvert replacements (2030), and a medium mill-and-overlay north of Pipestone (2031).
District 8 Minnesota Department of Transportation (MnDOT) staff presented the county’s portion of the Statewide Area Transportation Improvement Program and the CHIP (Corridor/CHIP) schedule to commissioners on Sept. 9, outlining programmed surface and drainage work on Highways 75 and 30 across the next decade.
Megan DeCheffer, MnDOT planning coordinator for District 8, and district engineers described four projects affecting Pipesaukee County: an unbonded concrete overlay on Highway 75 from Cassaw 9 to County Road 57 in fiscal year 2026; another unbonded concrete overlay on Highway 75 in the Pipestone/industrial park corridor up to Highway 30 in fiscal year 2029 (this project includes an off‑road path for the in‑town segment); a medium mill‑and‑overlay on Highway 30 from US 75 in Pipestone to 60th Avenue in Lake Wilson with five box‑culvert replacements and ADA improvements in 2030; and a medium mill‑and‑overlay on Highway 75 north of Pipestone from Pipestone Creek to South Valley Street in Lake Benton in 2031.
In response to commissioner questions, MnDOT engineers explained technical details for concrete overlays used on older full‑depth asphalt pavements: crews typically mill off 3–4 inches of existing asphalt, then place an unbonded concrete overlay of roughly seven inches (with dowel bars/load transfer between 13‑ or 14‑foot concrete panels and reinforcement over culverts). The engineers said the unbonded overlay provides a durable driving surface where full‑depth asphalt has deteriorated from the bottom up.
Commissioners raised local concerns about missing roadside town identification signs; MnDOT staff said there has been a statewide sign consolidation effort and agreed to follow up with traffic engineers about local requests. The board thanked MnDOT for moving a priority Highway 75 concrete project up in the schedule.
MnDOT staff noted that the first four years of the program are funded/scoped, while later years (years five to ten) remain more fluid and subject to change based on funding and needs. No formal county action was required; the presentation served to inform the board and solicit local input.
