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© 2015 HDR, all rights reserved.

Project #EM 0295(45)130 PCN 020VApril 20, 2020

I-29 Exit 130 (20th Street S.) Interchange Project

Project Team(& private donors)

Purpose of the Presentation

1. Inform the public about the project•Background•Current Status•What’s next

2. Provide project schedule3. Identify project funding4. Request comments and questions

about the project (due by May 4)

Project Location

4/20/2020

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Project andEnvironmentalStudy Area

• To relieve traffic congestion on other streets (both now and in the future)

• To better connect workers and places of employment

• To provide access for planned economic development.

Purpose of the Project

Feedback from the public is requested via the web site.

Traffic backups on 32nd Avenue at 6th Street(photo from before 2017 6th Street

reconstruction)

1. Studies from 2000 to 2018 identified the need for another street crossing of I-29.“An additional I-29 overpass or interchange will provide needed congestion relief on 6th Street and allow additional access to the industrial park. Of the alternatives considered, a new 20th Street S. interchange provides the greatest congestion relief.” 2013 Brookings Area Master Transportation Plan

2. Interchange grant funding application was submitted in July 2019.

3. Interchange grant funding was approved in November 2019.

Background

Traffic flows much better but delays at 6th Street

intersections may still be longer than desired.

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Existing 20th Street South(west of I-29)

1. SDDOT and City of Brookings hired the HDR/Banner team to complete:• Environmental and

interchange studies• Design plans for construction• Acquire permits and right-of-

way2. Public input is requested on the

project via web site and meetings with affected landowners.

Current Status

Existing I-29 @ 20th Street South

Existing 20th Street South(west of 22nd Avenue South)

1. Determine new 20th Street S section.

What’s Next?

New 20th Street S may look like this.

22nd Avenue S

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Interchange Options from 2016 Study

2. Refine interchange options from previous studies to:• Minimize adjacent property

impacts• Provide appropriate property

access

What’s Next?

Study Area for Interchange Analysis

3. Analyze traffic impacts of the new interchange to:• Adjacent I-29 interchanges• Other City streetsFor year 2023 (construction complete) and year 2045 traffic volumes.

What’s Next?

Existing 6th StreetInterchange

Existing 217th StreetInterchange

NewInterchange

3 miles

2 miles

20th Street S

6th Street

217th Street S

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Year 2045 Daily Traffic Without New Interchange

Traffic Comparison

30% increase from existing

22nd

Aven

ue

6th Street

Residential Areas

Employment Areas

34th

Aven

ue

From 2016 and 2018 traffic studies

Year 2045 Daily Traffic Without New Interchange

Traffic Comparison

22nd

Aven

ue

6th Street

Year 2045 Daily Traffic With New Interchange

Traffic volumes similar to today

or less

6th Street

32nd

Aven

ue32

ndAv

enue

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New interchange relieves traffic on

6th Street

20th Street S

Traffic Comparison

22nd

Aven

ueYear 2045 Daily Traffic With New Interchange

Traffic volumes similar to today

or less

6th Street

New Interchange at 20th Street S

32nd

Aven

ue

In process of updating traffic study

4. Analyze social, environmental, and economic impacts per National Environmental Policy Act of 1969 (NEPA)• Park and recreation facilities

(Section 4(f) and 6(f) properties)

What’s Next?

Edgebrook Golf Course

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4. Analyze social, environmental, and economic impacts per National Environmental Policy Act of 1969 (NEPA)• Traffic noise• Floodplain and wetlands• Cultural & historic resources• Threatened & endangered

species

What’s Next?

Western Estates Homes

Old Gravel Pit

4. Analyze social, environmental, and economic impacts per National Environmental Policy Act of 1969 (NEPA)• Land use• Right-of-way

What’s Next?

Interchange Options from 2016 Study

No way to build new interchange without impacting some property(s).Goals:• avoid, minimize, and/or mitigate impacts• select option with the least damaging

impacts

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4. Analyze social, environmental, and economic impacts per National Environmental Policy Act of 1969 (NEPA)• Economic Development

What’s Next?

Future Land Use Map(from grant application – on web site)

20th Street S

Better access with interchange can spur

development.

2019

• Funding grant application (July)• Funding grant award (November)• Site survey

Mar Apr2020

• Complete traffic counts (3/14/20)• Public information web site release and landowner meetings• Refine interchange options

May Jun 2020

• Update traffic study (Interchange Justification Report)• Analyze environmental impacts and update screening document• Recommend preferred option

Jul Aug2020

• Public meeting and landowner meetings• Complete draft Environmental Assessment• 30% design plans complete

Sep Oct2020

• Release draft Environmental Assessment at public meeting• 60% design plans complete• Finalize right-of-way acquisitions

Nov Dec2020

• Finalize Environmental Assessment• Obtain Finding of No Significant Impact (FONSI)

2021

• Finalize plans• Acquire right-of-way• Acquire permits

20222023

• Anticipated Construction

Schedule

Normally4 year

timeframe

Accelerated by funding

grantrequirements

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Better Utilizing Investments to Leverage DevelopmentCost and Funding

Western Estates Homes

From funding grant application

(subject to change during the project)

Embankment

Submit your comments andquestions by May 4 on the web site:

www.20thstinterchange.com

Additional contacts:Jackie Lanning, PECity of Brookings520 3rd Street, Suite 140Brookings, SD 57006605-692-6629JLanning@cityofbrookings.orgJames Unruh, PEHDR Engineering, Inc.6300 S. Old Village Place, Suite 100Sioux Falls, SD 57108605-977-7740James.Unruh@hdrinc.com

Questions and Comments