March 1, 2011

Why an interchange at this location?• TH 15 Corridor Study 2007• Nine Signalized intersections• Six in Top 50 High Crash Cost• Study outcome = convert to freeway

– Price tag $300 Million+– Phased construction where possible

Why an interchange at this location?• TH 15 & Stearns CSAH 120• Border between Sartell and St. Cloud• Medical Campus’s on west side

– +$70 million construction • 100 Acre retail complex under construction on east

side– Sam’s Club, Super WalMart, assorted smaller retail

Why an interchange at this location?

• NB dual left turn lanes 1500’ length• Signal at 81% capacity• Future volumes

Why an interchange at this location?• Greater Minnesota Interchange

Solicitation– Promote Economic Development– Safety Concerns– $10 million– Local cost participation

Why a Diverging Diamond Interchange?

• Standard Diamond Signals vs

Roundabouts? High left turn volumes Eight lane bridge

Why a Diverging Diamond Interchange?

• Single Point Diamond – Better capacity– Big bridge– Higher Cost– Can’t expand

Why a Diverging Diamond Interchange?• DDI

– Moves more traffic with fewer lanes

– Smaller bridge– Removes left turns –

fewer crashes and less delay

– Reserve capacity– 18 conflict points vs 30

Design Constraints• Awkward county road alignment• Existing commercial development• Two neighborhoods in SE quadrant, one a

potential environmental justice issue• Sauk River• Utility crossing• Pond• Water Table?

Design Constraints

Medical Clinics

Sam’s Club

CentraCare

Hennen’s

Neighborhoods

Co. Rd 120

TH 15

Current Layout

Public Meeting

Public Meeting

Meeting Outcome

- Positive comments- Build it Now!- Online links to video from Missouri sold the concept

I-270 & Dorsett Road - St. Louis, Missouri – Aerial

I-44 and Route 13 Springfield, Missouri – Driver’s View