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Enhancing US-14 Corridor: Cost-saving Strategies & Safety Measures

Explore cost-effective solutions & safety enhancements for the US-14 corridor expansion from Nicollet to North Mankato. Learn about construction alternatives, roadway designs, and project viability to optimize performance and budget allocation. Contact Zachary Tess, the Project Manager, for more details. Visit the official corridor website.

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Enhancing US-14 Corridor: Cost-saving Strategies & Safety Measures

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  1. US 14 Expansion Nicollet to North Mankato Zachary Tess D7 Project Manager

  2. US 14 – New Ulm to North Mankato ADT & Serious Crashes 2009 AADT (HCAADT: 12.6%); 2007-2011 K+A Crashes

  3. Constrained vs. Corridor Typical Constrained

  4. Constrained Inset

  5. Corridor Typical - (WB Construction Shown)

  6. Corridor Typical Inset

  7. Construction – R/W Cost

  8. Why are Construction Costs Higher in Constrained?!? • Additional Pavement & Aggregate needs • 14’ inside median vs. 4’ shoulder • Loonheads – U-turns for truck/agg equipment • Crown correction–cheaper than drainage structures • Still need R/W (south side utility poles)

  9. R/W cost and Constrained Viability • Current R/W Costs - $12K/acre • Provided by District Real Estate Rep • When Construction + R/W becomes equal between alternatives • $46K/acre – Assumes HTCB in both alternatives • $66K/acre – HTCB only in constrained

  10. Constrained Inset Option 1 - GDSU • 8’ SHOULDERS (DIMINISHING RETURNS FOR WIDER SHOULDERS) • KEEP 12’ LANES FOR HIGH SPEED RURAL • MINIMIZE MEDIAN WIDTH (ALLOW 3’ DEFLECTION IN THRU LANES) • RUMBLE STRIPS BOTH SIDES (CRASH HISTORY OF DROWSY/INATTENTIVE DRIVERS) • STICK WITH TUBE DELINEATORS & CONSIDER CABLE IF FUTURE NEED • SAVES 10’ OF WIDTH AND UNWARRANTED CABLE BARRIER • ~$1.5M+$1.7M

  11. Corridor Typical Option 2 - GDSU • 53’ MEDIAN WIDTH WITH 1:4 INSLOPES AND 10’ DITCH BOTTOM (SAVES 13’ AND ALLOWS SPACE FOR RCI) • 12’ RIGHT LANE AND 8’ SHLD ON WB TH 14 (SAVES ADDITIONAL 2’) DELAY INSTALL OF CABLE BARRIER UNTIL WARRANTS ARE MET • SAVES 25’ OF R/W FOR ENTIRE PROJECT • ~$230,000 r/w +MATERIAL COSTS+$1.2M CABLE

  12. Constrained Typical Option 3 - GDSU • RAISED MEDIAN BARRIER • USE OF 2’ SHLD REDUCES MEDIAN WIDTH BY 8’ • REDUCED MAINTENANCE AND SNOW MELT PROBLEMS • SIMILAR COST TO HIGH TENSION CABLE BARRIER • USE OF 8’ SHLD LIKE OPTION 1 YIELDS 10’ WIDTH REDUCTION • WIDTH REDUCTION SAVES ~$1.5M Tech Memo

  13. Pros and ConsComparison of Alternatives • Corridor Typical • Pros • Lower Construction Cost • Introduction of alternative intersection treatment types – RCUTs • Lower Maintenance Cost • Cons • Additional farmland/wetland impacts • Constrained • Pros • Less impacts to farmland/wetlands • Evaluation for other corridors statewide • Cons • Higher Construction Cost • Higher Maintenance Cost

  14. Nicollet Bypass Discussion • Construction • $10M - $15M • 4-lanes only • No Interchange • R/W • $4M • 4-lanes • Relocations • Interchange *Currently Unfunded

  15. Nicollet Bypass Discussion • Why to west? • RSA – Critical Crash rate intersections • TH 14/TH 111 in Nicollet • TH 14/TH 99 in Nicollet • Local and Political Momentum • Local Infrastructure planning/needs • Wastewater treatment planning – North Mankato • City expanding • 2000 population – 890 • 2010 population – 1100 • 23.5% increase

  16. Future MPC Meetings • TH 14/TH 15 Intersection Discussion • Alternatives • Discussion of inclusion with MN River Bridge in New Ulm in 2018

  17. Additional Questions or Comments • Contact Information • Zachary Tess – D7 Project Manager • Zachary.tess@state.mn.us • 507-304-6199 • Corridor Website • http://www.dot.state.mn.us/d7/projects/14newulmtonmankato/

  18. Joint Layout - Constrained

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