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Mn /DOT District 3 TH 15 Diverging Diamond Interchange

Mn /DOT District 3 TH 15 Diverging Diamond Interchange. 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.

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Mn /DOT District 3 TH 15 Diverging Diamond Interchange

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  1. Mn/DOT District 3TH 15 Diverging Diamond Interchange March 1, 2011

  2. 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

  3. 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

  4. Why an interchange at this location? • NB dual left turn lanes 1500’ length • Signal at 81% capacity • Future volumes

  5. Why an interchange at this location? • Greater Minnesota Interchange Solicitation • Promote Economic Development • Safety Concerns • $10 million • Local cost participation

  6. Why a Diverging Diamond Interchange? • Standard Diamond • Signals vs Roundabouts? • High left turn volumes • Eight lane bridge

  7. Why a Diverging Diamond Interchange? • Single Point Diamond • Better capacity • Big bridge • Higher Cost • Can’t expand

  8. 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

  9. 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?

  10. Design Constraints Medical Clinics Sam’s Club TH 15 Co. Rd 120 Hennen’s Neighborhoods CentraCare

  11. Current Layout

  12. Public Meeting

  13. Public Meeting Meeting Outcome - Positive comments - Build it Now! - Online links to video from Missouri sold the concept

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

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

  16. Mn/DOT District 3TH 15 Diverging Diamond InterchangeQuestions?

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