WIS 100 (Layton Avenue-Silver Spring Drive) Corridor Study - Milwaukee County

Project status | Corridor importance | Purpose and need | Schedule | Contacts

Project location

WIS 100 (South 108th Street and North Mayfair Road), from Layton Avenue to I-94 and Watertown Plank Road to Silver Spring Drive, within the communities of Greenfield, West Allis, Wauwatosa and Milwaukee, in Milwaukee County.

Project overview

The 10 mile corridor study is divided into two sections:

  • South section - This 4.8 mile section between Layton Avenue and I-94 is in the cities of Greenfield and West Allis.
  • North section - This five mile section between Watertown Plank Road and Silver Spring Drive is in the cities of Wauwatosa and Milwaukee.

The study does not include the approximate one mile section of WIS 100 between I-94 and Watertown Plank Road that was reconstructed in 2013, as part of the Zoo Interchange project.

The study will:

  • Analyze traffic at all signalized intersections
  • Evaluate the potential need for additional lanes
  • Address bicycle and pedestrian accommodations
  • Evaluate access location and median openings to improve highway safety and efficiency
  • Assess impacts of the proposed improvement alternatives

The study seeks to identify project improvements that will provide a safe and efficient transportation system in the WIS 100 corridor that meets long term mobility and access needs. Study outcomes include:

  • Environmental Assessment (EA)
  • Design and study report
  • Preliminary plan
  • Access management vision


Study started in 2013 and is scheduled for completion in 2018.

Currently, the study is beginning:

  • Development of alternatives
  • Comparison of alternatives

Completed to date:

  • Information gathering phase
  • Analysis of existing conditions
  • Project introduction to stakeholders

Corridor importance

WIS 100 is an important north-south transportation arterial that serves as a link to jobs, schools, businesses, parks churches and health care. It is a regional retail destination and serves as a connection to the Southeast Region Freeway System.

Purpose and need

  • Replacing aging pavement
    • The majority of the WIS 100 corridor was last reconstructed in the late 1950's and 1960's.
      Resurfacing projects have been occurring from the 1980's through 2014.
    • The one mile section between I-94 and Watertown Plank Road was reconstructed in 2013, as part of the Zoo Interchange project.
    • Continued overlays are not cost effective because the poor condition of the underlying pavement needs to be addressed.
  • Improve safety
    • Total crash rates are higher than the statewide average for similar highways along 80 percent of the corridor.
    • Injury crash rates are higher than the statewide average for similar highways along 85 percent of the corridor.
    • Nine out of 18 signalized intersection have a crash rate greater than the WisDOT Southeast Region average rate.
    • The high percentage of angle and rear-end crashes indicate that the numerous driveways and median openings along the corridor, create conflicts that contribute to safety concerns.
    • During the crash study period (2008 - 2012), there were 47 crashes involving bicycles or pedestrians, 46 of those crashes involved injuries.
  • Address bridge needs
    • Six of the 10 structures within the north and south sections are classified as either not meeting current design standards (too narrow) or they may not be able to carry heavy loads.
  • Improve multimodal accommodations
    • Residents, employees and customers of the area businesses should have multiple transportation choices available to them to access the many destinations along WIS 100.
    • WIS 100 has no on-street bike accommodations north of Watertown Plank Road or south of I-94.
      Sidewalk is not present along WIS 100 at the following locations:
    • East side - Theodore Trecker Way to I-94 (0.04 miles)
    • East side - North Avenue to Burleigh Street (One mile)
    • West side - Townsend Street to Capitol Drive (0.06 miles)
    • East side - Capitol Drive to Hampton Avenue (One mile)
    • The Milwaukee County Transit System (MCTS) has a number of routes along and across WIS 100. Transit uses the outside driving lane. Congestion at signalized intersections has caused transit delays and inconsistent scheduling.
  • Improve traffic operations
    • "Level of Service" (LOS) is a measure of delay based on the amount of time spent waiting at either a signalized or unsignalized intersection. LOS ranges from LOS A (good) to LOS F (failing).
      WisDOT's goal for traffic operations is LOS D or better for all movements in the design year (2045 in the south section and 2050 in the north section)
    • Traffic along the WIS 100 corridor is projected to grow:
      • 0.5 percent to 0.7 percent per year in the south section
      • 0.5 percent to one percent in the north section
    • The WisDOT projected traffic volumes were compared to the Southeast Wisconsin Regional Planning Commission (SEWRPC) projections for traffic in the area in early 2014 and found to be similar.
    • The number of turning movements at intersections along the corridor that do not meet the WisDOT LOS D goal is as follows:
      • 24 during the existing a.m. peak hour
      • 45 during the future (2045 or 2050) a.m. peak hour (an increase of 84 percent)
      • 25 during the existing p.m. peak hour
      • 52 during the future (2045 or 2050) p.m. peak hour (an increase of 108 percent)


Current (this year)

  • Early 2017 - PIM #3 (refined alternatives) anticipated
  • Mid/late 2017 - PIM #4 (further refined alternatives; recommended alternative) anticipated

Future (next year and beyond)

  • 2014-2018 - Environmental Assessment
  • Early 2018 - Public Hearing anticipated - preferred alternative presented for final comment
  • Late 2018 - Environmental document completed

Past (anything prior to today)


  • 2016 - Refine alternatives
  • May 24 and 25, 2016 - PIM #2 (presentation of range of alternatives)
  • February 25, 2016 - PAC meeting #3, South corridor
  • February 23, 2016 - PAC meeting #3, North corridor


  • ​2015 - Develop and evaluate alternatives
  • January 20, 2015 - PIM #1, North section
  • January 27, 2015 - PIM #1, South section


  • 2014-2015 - Collect data and identify needs
  • Collect data and identify needs
  • November 18, 2014 - Project Advisory Committee (PAC) meeting #2, South corridor
  • November 17, 2014 - PAC meeting #2, North corridor
  • June 11, 2014 - PAC meeting #1, North corridor
  • June 10, 2014 - PAC meeting #1, South corridor


Frank Pritzlaff, WisDOT Project Manager
(262) 548-5683

Michael Pyritz, WisDOT Southeast Region Communications Manager
(262) 521-5373

Wisconsin Department of Transportation (WisDOT)
Southeast Region
141 NW Barstow St.
P.O. Box 798
Waukesha, WI 53187-0798
Phone: (262) 548-5902
Fax: (262) 548-5662
TDD: 711