Zachary TessD7 Project Manager

Highway 14 New Ulm to North Mankato ADT and Crashes

RSA High Crash Intersections Fatalities (8 total) Serious Injury (5 total)

2009 ADT– 12.6% Heavy Vehicle Traffic (2007-2011 K+A Crashes)

New Ulm Pop. 13,500

Courtland Pop. 600

Nicollet Pop. 1100

North Mankato / Mankato Pop. 52,700

US 14 – New Ulm to North MankatoADT & Serious Crashes

2009 AADT (HCAADT: 12.6%); 2007-2011 K+A Crashes

Constrained

Corridor Typical - (WB Construction Shown)

Constrained Corridor TypicalConstruction - 2018 $16.4M - $24.6M $14.1M - $21.2M

R/W $0.3M $1.0MHigh TensionCable Barrier

$1.7M *$1.2M

*Future Consideration

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)

Construction Difference

Pavement andaggregates

$1.5M

Loonheads $0.5MCrown

Correction$0.3M

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

R/W Cost per acre $12,000

ConstrainedCorridorTypical

Construction - 2018 $16,407,934 $14,106,085High Tension Cable Barrier

$1,700,000 $1,200,000

R/W $241,612 $966,446

Total $18,349,546 $16,272,531

R/W Cost per acre $46,386

ConstrainedCorridorTypical

$16,407,934 $14,106,085

$1,700,000 $1,200,000

$933,950 $3,735,799

$19,041,884 $19,041,884

• 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

• 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

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

Constrained◦ Pros

Less impacts to farmland/wetlands

Evaluation for other corridors statewide

◦ Cons Higher Construction Cost Higher Maintenance Cost

Corridor Typical◦ Pros

Lower Construction Cost Introduction of alternative

intersection treatment types – RCUTs

Lower Maintenance Cost

◦ Cons Additional

farmland/wetland impacts

Construction◦ $10M - $15M

4-lanes only No Interchange

R/W◦ $4M

4-lanes Relocations Interchange

*Currently Unfunded

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

TH 14/TH 15 Intersection Discussion◦ Alternatives◦ Discussion of inclusion with MN River Bridge in

New Ulm in 2018

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/14newulm

tonmankato/