November Meeting Announcement

DATE:    Wednesday, November 30th
PLACE:  Hawthorne Lucky Lab Brew Pub, 915 SE Hawthorne Blvd
TIME:     11:30 a.m: Networking, 12:00 – 1:00 p.m: Presentation
SPEAKER:  Ken Vigil, Mauria Pappagallo and Nate Robinson, ESA
TOPIC: Water Resources Engineering for Portland’s Tilikum Crossing


Tilikum Crossing, Portland’s first new bridge over the Willamette River since 1973, is part of TriMet’s 7.3-mile Portland-Milwaukie Lightrail transit project that connects downtown Portland with the City of Milwaukie.  This 1,720-foot long cable-stayed transit bridgetilikum includes two pylon-supported pier towers within the active channel of the Willamette River.

This presentation will focus on the unique water resources engineering aspects of this large transit bridge project.  Design challenges included providing fish passage around bridge piers for endangered salmonids, understanding and managing hydraulic scour and channel bed erosion, and providing stormwater management for runoff from the bridge deck.

Tilikum Crossing (Bridge of the People) is the largest car-free bridge in the United States. As the latest addition to Portland’s bridge-scape, Tilikum Crossing carries the Portland Streetcar, the MAX Orange Line, TriMet buses, and cyclists and pedestrians over the Willamette River.


Ken Vigil, PE, is a senior civil and environmental engineer and one of the founders of Vigil-Agrimis.  He has worked on water resources projects in the Pacific Northwest and the Great Lakes region for almost 35 years, including projects for fish passage, bridge hydraulics, stream restoration, water quality, and stormwater management.
Mauria Pappagallo, PE, is a water resources engineer with over a decade of professional experience in fluvial geomorphology, bridge hydraulics, hydraulic modeling, scour countermeasure design, and riparian and floodplain restoration design.   She has reviewed scour issues and designed scour countermeasures at bridge and culvert sites throughout Oregon and Washington.

Nate Robinson, PE, is a Civil and Water Resources Engineer with 7 years of experience in stormwater design, hydraulic and hydrologic analysis, utility design, and site design. He has worked extensively on innovative stormwater projects within the City of Portland and throughout Oregon.