Data as the influencer for engineering, partnerships, and policy in addressing
the Ross Island Harmful Algal Bloom
The Harmful Algal Bloom (HAB) in the Ross Island lagoon has been occuring with increasing frequency, and has led to the ODEQ listing of the lagoon as impaired. These blooms are caused by cyanobacteria, which thrive in warm and stagnant where nutrients are available. HABs pose critical risks for environmental and human health. Control of them is difficult because it requires: 1) reducing nutrient availability, 2) preventing stagnant waters, 3) reducing light availability, and/or 4) reducing water temperature. Addressing the HAB at Ross Island is particularly complex due to a number of site constraints. OSU is supporting a broad range of stakeholders in working towards addressing the HAB at Ross Island, including hosting a design charrette, synthesizing current knowledge about the system, and developing hydraulic models of proposed solutions to examine their feasibility and effectiveness.
Ross Island HAB Design Charrette
February 25th at OSU Foundation Portland Center Boardroom (Room 2002)
- Focus the scope of OSU’s design analyses to be as useful and relevant as possible
- Facilitate discussion of process for addressing the HAB and ecological uplift in the lagoon.
1:30-2:00pm: Plenary session
- Microbiology of HABs (Kurt Carpenter, USGS)
- Habitat needs of Chinook in the Lower Willamette (Tom Friessen, ODFW)
2:00-2:10: Coffee break
2:10-3pm: Community café
- Groups rotating through tables for focused, hosted discussion on:
- Values – What we want to protect and enhance?
- Alternatives – What solutions should we prioritize and where?
- Evaluation criteria – How do we evaluate alternatives?
3:00-3:10: Coffee break
3:10-3:40: Community café hosts report back
3:40-4:00: Next steps
Synthesis of Ross Island history, regulations, and science
Ross Island history, ecology, and vision
Bureau of Environmental Services (2018) Willamette Natural Resource Inventory of Site WR19 Ross Island/Oaks Bottom
Houck M, Frank C, Medeiros M, Sallinger B, Faha M, Williams T. (n.d.) Envisioning Ross Island
HAB biochemistry and control
Mitrovic SM, Oliver RL, Rees C, Bowling LC, Buckney RT (2003) Critical flow velocities for the growth and dominance of Anabaena circinalis in some turbid freshwater rivers. Freshwater Biology 48: 164-174.
Bormans Webster (1997) A mixing criterion for turbid rivers
Salmon in the Lower Willamette
Oregon Department of Fish & Wildlife (2005) Biology, Behavior, and Resources of Resident and Anadromous Fish in the Lower Willamette River
Friesen et al. (2007) Outmigration of Juvenile Chinook Salmon in the Lower Willamette River, Oregon
Oregon Department of Environmental Quality (2017) Ross Island Sand and Gravel 401 Water Quality Certification
Ross Island hydrodynamics
Nortwest Hydraulic Consultants Inc. (2010) No-rise Analysis for Zidell Property Remediation Project
West Consultants Inc. (2001) Hydraulic and Sediment Transport Modeling For the Willamette River And Ross Island Lagoon
West Consultants Inc. (2002) Hydraulic and Sediment Transport Modeling For the Willamette River And Ross Island Lagoon