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Enhancing Traffic Flow: TH 15 Diverging Diamond Interchange

Explore the rationale behind the TH 15 Diverging Diamond Interchange in District 3, improving safety, promoting economic growth, and accommodating increasing traffic volumes. Learn about the unique design challenges and benefits of this innovative interchange.

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Enhancing Traffic Flow: 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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