AEG Oregon Chapter - September 9th Meeting
Old Market Pub
Portland, OROnline and In-Person Event
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Abstract:
Kellogg Dam, constructed in the 1850s and obsolete by the 1890s, underlies a 1930s-era bridge on Highway 99E in Milwaukie, Oregon. It blocks upstream fish passage to over 17 miles of habitat and forms an approximately 14-acre reservoir impoundment, largely filled with accumulated sediment. The North Clackamas Watersheds Council, American Rivers, the Oregon Department of Transportation (ODOT), and the City of Milwaukie are primary project partners in the Kellogg Creek Restoration & Community Enhancement Project (KCRCEP). The KCRCEP will remove Kellogg Dam and upgrade critical infrastructure by constructing a channel-spanning highway bridge; increase accessibility and public safety with a new multi-use pathway; re-establish fish passage to the upstream watershed and connectivity at the lower Kellogg Creek-Willamette River confluence; and restore ecological functionality to several acres of currently submerged or buried riparian habitat. The geologic setting of the site and vicinity includes Waverly Heights and Columbia River basalts, Missoula Flood deposits, alluvium, dam-impounded sediment, and extensive areas of artificial fill.
In summer 2024, GRI worked with the KCRCEP project partners to implement an ambitious on-water exploration program upstream of Kellogg Dam and downstream of SE Oatfield Road. Environmental characterization including sediment sampling and analysis was completed under multi-agency Portland Sediment Evaluation Team (PSET) oversight. GRIs geotechnical exploration program was designed with input from ODOT, project restoration design engineers, and biologists. On-water work included 31 machine-drilled borings, 8 cone penetration test (CPT) probes, 21 sediment sampling locations, and 16 limited-access explorations. A combination of barge-mounted, amphibious/difficult access drilling equipment and hand exploration tools were used. Data acquired during this field campaign informed the project environmental sediment management approach including excavated soil handling and disposal options of contaminated sediments; provided geotechnical data informing design details for bridge replacement, dam removal, and post-restoration channel and floodplain features; and supplied essential engineering information for slope stability evaluations. Updated infrastructure, removal of contaminated in-stream sediment, construction of stable channel and floodplain elements within the former lake impoundment area, and extensive re-vegetation with native flora are key project features. A modern and resilient highway bridge, enhanced ecological function of Kellogg Creek and the surrounding watershed, and increased accessibility are all clear project benefits.
Speaker Bio:
Greg Martin is a Senior Geologist with GRI in Tigard, Oregon and a resident of the Kellogg Creek watershed. His professional work includes oversight and support of environmental and engineering geology and geotechnical projects in Oregon, Washington, and California. He earned a BS in Environmental Geology from UC Santa Cruz in 2004 and an MS in Geology (research: Active tectonics, Tectonic geomorphology, Paleoseismology) at Portland State University in 2020. He is professionally licensed as a geologist in Oregon (CEG, RG), Washington (LEG, LG), and California (PG). The KCRCEP is important to him because it highlights the importance of land stewardship, it is technically challenging and rewarding, and it is a project that upon completion will provide a huge benefit to the people of Oregon and our shared environment. Gregs goal is for his now 8-year-old daughter to one day count salmon in the creek where she now counts shopping carts. |
Location
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Old Market Pub
6959 SW Multnomah Blvd.
Portland, OR 97223
United StatesOnline and In-Person Event Timezone: America/Los_Angeles
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Dates
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| Start: | Tuesday Sep 09, 2025 7:00 PM | | End: | Tuesday Sep 09, 2025 9:00 PM |
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| Kid Friendly: No |
| Dog Friendly: No |
| Non-Smoking: Yes! |
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