HIGHWAY 36 & MANNING AVENUE (CSAH 15) INTERCHANGE PROJECT

P U B L I C O P E N H O U S E

WELCOMEMARCH 19, 2020

T H E B I R T H P L A C E O F M I N N E S O T A

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

HIGHWAY 36 CORRIDORHighway 36 is a vital principal arterial serving the north and northeast area of the Twin Cities metropolitan area. Commuter, freight, and recreational traffic use this route as a critical link to key regional, interregional, and interstate destinations.

MINNESOTA

WISCONSIN

Ram

sey

Was

hing

ton

Lake St Croix

Lake JaneLake E

lmo

Lake Olson

0 0.7 mi

MINNESOTA

36

MINNESOTA

36

MINNESOTA

36

MINNESOTA

95

MINNESOTA

95

17COUNTY

15COUNTY

15COUNTY

5COUNTY

694

694

Stillw

ater B

lvd

Lake

Elm

o Av

e

Keat

s Ave

Hilto

n Tr

Man

ning

Ave

Gree

ley S

tO

akgr

een

Ave

Osg

ood

Ave

STILLWATER

BAYPORTOAK PARK HEIGHTS

LAKE ELMO

NORTH ST. PAUL

MAHTOMEDI

GRANT

Highway 36/I-694Existing Cloverleaf

Interchange

Highway 36/Hadley AveGrade Separated

Interchange in DesignComplete 2020

Highway 36/Keats AveReduced Conflict

Intersection Constructed 2006

Highway 36/Manning AveExisting At-Grade

Intersection Shovel Ready

Highway 36/Greenley St/ Oakgreen Ave

At-Grade Intersection with Traffic Signal Constructed 2014

Highway 36/Highway 95 Diamond Interchange

Constructed 2017

St. Croix River Crossing River Bridge

Constructed 2017

Highway 36/Hilton TrailGrade Separated Interchange

with Roundabouts Constructed 2014

Highway 36/Lake Elmo Ave

Existing At-Grade Intersection

Highway 36/Stillwater BlvdExisting Grade Separated

Diamond Interchange

Highway 36/OsgoodAt-Grade Intersection

with Traffic Signal Constructed 2014

Highway 36/NorellExisting At-Grade Intersection

with Traffic Signal

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

PROJECT PURPOSE & GOALSPROJECT PURPOSE & GOALS

PROJECT TIMELINE

2017 2018 2019 2020 2021

CONCEPTUAL DESIGN & TRAFFIC ANALYSIS

DESIGN PROCESS, NEPA & RIGHT OF WAY

BIDDING

CONSTRUCTION

The primary purpose of this project is to improve safety and mobility at Highway 36 & Manning Avenue

Other Goals and Objectives:• Maintain access to neighborhoods and

future development• Accommodate local road connectivity• Provide safe, non-motorized access (trails,

walks, etc.)

We are here

Open House #1Accomplished Since Open House #1:• Evaluated Alternatives• Screened Against Project Goals• Coordinated with Local

Governments

Accomplished Since Open House #2:• Identified Recommended Alternative• Completed Preliminary Design (Approved

by MnDOT)• Documented Environmental Impacts

Open House #2 Open House #3

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

NEED FOR PROJECT Why do we need to do something?

If we do nothing...

Intersection is approaching its full

capacity (long delays/frustrations)

Delays will become intolerable

56 Reported Crashes

(2011 to 2015)

1Fatality

Traffic trying to turn onto Manning will spill

back onto Hwy 36

Intersection ranked

75 (out of 8,000)

based on statewide crash cost

comparisons

Crashes will likely increase

20-30% Increase in traffic expected by

2040.

In addition to 20% increase since the opening of the St.

Croix Crossing Bridge

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

DAILY TRAFFIC VOLUME – EXISTING & FORECASTED

Developer Owned

Developer Owned

MINNESOTA

36

MINNESOTA

36MINNESOTA

36

17COUNTY

15COUNTY

15COUNTY

5COUNTY

LEGEND

Interchange Concept

Full Access Intersection

Potential Local Road

Future Extension

Closed Access/Roadway Realignment

Direction of Traffic

Pedestrian Trail

x x xx x x

N

Lake

Elm

o Av

e

17,00020,000

25%Increase

NoIncrease

500500

41,00051,000

42,00049,000

33,000

14,500

63,00058,000

15%Increase

20%Increase

STILLWATER

STILLWATER TWP

OAK PARK HEIGHTS

LAKE ELMO

GRANT STILLWATER

STILLWATER TWP

OAK PARK HEIGHTS

LAKE ELMO

GRANT

Lake

Elm

o Av

e Man

ning

Ave

Stillw

ater

Blvd

Lake

Elm

o Av

e Man

ning

Ave

Stillw

ater

Blvd

x,xxx Existing 2018

x,xxx Potential 2040 with full development

Legend

Future 2040NOTE: Future traffic volumes do not account for potential development areas shown.

x,xxx

Traffic Distribution

14% 16%

69% 1%

MINNESOTA

36MINNESOTA

36

15COUNTY

Man

ning

Ave

Man

ning

Ave

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

CONCEPT VISUALIZATION

Interchange Concept: Not for Construction - Looking North East

Bridge Detail Concept: Not for Construction - Looking North WestExisting View: Looking North East

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

ENVIRONMENTAL DOCUMENTATION:

Environmental Review Summary• The project includes federal-aid highway funding; therefore, an environmental review under

the National Environmental Policy Act (NEPA) has been completed.

• The NEPA document provides information about the purpose and need; alternatives evaluation and identification of a preferred alternative; environmental impacts; and proposed mitigation measures.

• Potential impacts of the project studied in the environmental review include:

Traffic Noise• Field measurements were collected in

fall 2018.

• Modeled noise levels at most all locations in the project area are below Federal noise abatement criteria.

• A noise wall along the trail on the east side of Manning Avenue does not meet MnDOT’s reasonableness criteria and is not desired for current and future land uses.

Wetlands• Wetlands delineated in spring 2019.

• It is not possible to avoid all wetland impacts with the project.

• Features have been incorporated into the project design to minimize wetland impacts (e.g., retaining walls).

• Mitigation for wetland impacts will be acquired prior to construction.

Water Resources• The project will increase impervious

surface area compared to existing conditions.

• Existing drainage patterns will be maintained to the extent practicable.

• Stormwater basins will be constructed to treat and control runoff.

• Project includes construction of a water re-use system to irrigate Applewood Hills Golf Course.

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

TRAFFIC NOISE ANALYSIS

HIGHWAY 36 & MANNING AVENUE (CSAH 15) INTERCHANGE STUDY

TRAFFIC NOISE ANALYSIS

FIELD MEASUREMENTS- Document existing noise levels at

representative sites- Validate noise models (measured

levels +/- 3 dBA of model levels)

NOISE LEVEL MODELING- Develop noise models of project area roadways

and topology- Model noise levels at receptor sites (homes,

businesses, parks, etc.)- Model existing, future no-build and future build

conditions (Use 20-year traffic projections)

NOISE MITIGATION MODELING (FEASIBILITY AND REASONABLENESS)

Defined in MnDOT Noise RequirementsFeasibility- Acoustic feasibility (5 dBA reduction to be considered benefited)- Site ConstraintsReasonableness- Noise reduction design goal (reduction of at least 7 dBA at

minimum of one benefited receptor)- Cost effectiveness ($78,500 per benefited receptor)- Noise wall voting (viewpoints of benefited residents and

property owners)

- Noise levels approaching or exceeding FHWA noise abatement criteria

- 66 dBA (Leq for residential use)- Substantial noise increase (5 dBA or

more increase between future build noise levels)

NOISE ANALYSIS IS COMPLETE

IMPACTS IDENTIFIED?

YESNO

NOISE ANALYSIS IS COMPLETE

FEASIBLE AND REASONABLE NOISE WALLS ARE PROPOSED

FOR CONSTRUCTION

MEETS FEASIBILITY AND REASONABLENESS ?

YESNO

Source: Minnesota Pollution Control Agency

Decibel level of common noise sources

Field Measurement

Source: Minnesota Pollution Control Agency

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

NOISE ANALYSIS SUMMARY

0 800 1,600US Feet [

Legend

Approach or exceed the noise abatement criteria

Proposed Hwy 36/Manning Ave Interchange

Below the noise abatement criteria

Noise abatement criteria (NAC): upper limit of highway traffic noise levels for different land uses and activities. Noise abatement measures (e.g., noise walls) must be evaluated when modeled noise levels approach or exceed NAC limits at a receptor location.

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36

15COUNTY

Man

ning

Ave

5COUNTY

Stillw

ater

Blvd

17COUNTY

Lake

Elm

o Av

e

OAK PARK HEIGHTS

LAKE ELMO

GRANT STILLWATER

Sanctuary Neighborhood Noise Analysis Results

Existing noise levels (Leq, dBA)

2040 No Build noise levels

(Leq, dBA)

2040 Build noise levels

(Leq, dBA)

Change in noise levels(2040 Build - Existing)

(Leq, dBA)

47.2 - 54.2 47.9 - 55.1 48.6 - 55.8 0.5 - 2.4

• Includes modeled noise levels along trail• Approaching the noise abatement criterion is 66 dBA (Leq)

Summary

• Noise levels at one residence on the south side of Hwy 36 exceeds the Federal noise abatement criterion. A noise wall at this location would not meet MnDOT’s cost effectiveness threshold to be considered reason-able.

• Noise levels in the Sanctuary neigh-borhood are below the Federal noise abatement criterion for residential uses with the Hwy 36/Manning Avenue interchange.

• A noise wall along the trail on the east side of Manning Avenue does not meet MnDOT’s reasonableness criteria and is not desired for current and future land uses.

H I G H WAY 36 & M A N N I N G AV E N U E ( C S A H 15) I N T E R C H A N G E P R O J E C T

PROJECT FUNDING

Project Websitewww.co.washington.mn.us/Manning36Interchange

$29 MILLIONCURRENT FUNDING

$2 MILLIONLOCAL GOVERNMENTS

$5 MILLIONSTATE AID (WASHINGTON COUNTY C.I.P.)

$5 MILLIONMNDOT/METROPOLITAN COUNCIL MOBILITY FUNDS

$7 MILLIONMETROPOLITAN REGIONAL SOLICITATION (FEDERAL FUNDING)

$10 MILLIONTRANSPORTATION ECONOMIC DEVELOPMENT (TED) GRANT

$32 MILLIONTOTAL PROJECT COST

$3 MILLIONFUNDING DEFICITPOTENTIAL FUNDING SOURCES:- GENERAL OBLIGATION BONDS (NOT SECURED)