Creek, the largest of which is Westpoint Slough. The U.S. Geological Survey (USGS) and National Park Service (NPS) have conducted studies to observe and quantify erosion and sedimentation processes in the watershed. These studies have allowed researchers to determine the long-term effects of certain land practices and how they change the hillslopes and stream channels. These studies determined that the cumulative effect of these land practices was able to initiate multiple erosion processes, which generated a significant impact on the Redwood Creek Basin. Ecology Redwood Creek and Arroyo Ojo de Agua were fish sampled for steelhead trout (Oncorhynchus mykiss) in 1981, but no trout were found. The historical status of trout in the creek is unknown. At Stulsaft Park on the Arroyo de Ojo Agua tributary, a population of endangered Fountain Thistle (Cirsium fontinale var. fontinale) was discovered in 2007, and occupies seeps associated with serpentine soils. In Stulsaft Park it is found in an opening in a coffeeberry/bay laurel woodland. The plants may grow 6 feet tall and it is only found in a handful of locations in San Mateo County. A study conducted in 2016 that analyzed sediments in the Redwood Creek region determined that the benthic organisms in Redwood Creek were not significantly affected by the polychlorinated biphenyls (PCBs) in the sediment. However, the study determined that these PCBs could pass through the food chain and impact humans that consume fish from Redwood Creek. The study determined that these chemicals can have carcinogenic risks to the humans that consume them through fish from Redwood Creek. In August, 2018 Grassroots Ecology Assistant Director Junko Bryant led a project with the San Jose Conservation Corps and Redwood City to remove approximately 40 non-native Canary Island date palm (Phoenix canariensis) trees from a segment of Redwood Creek in the downtown area near Kaiser Permanente. These palm trees, some over 5 feet in diameter, had overtaken the creek bank and completely obscured public views of the creek. The creek banks have been replanted with native plants, increasing biological diversity and improving visibility for ambulances accessing the hospital. Gallery See also List of watercourses in the San Francisco Bay Area Dredging Seaport Centre Wetland References External links Redwood Creek Watershed Map, Guide to San Francisco Bay Area Creeks, Oakland Museum Rivers of San Mateo County, California Rivers of Northern California Tributaries of San Francisco Bay Redwood City, California