part of a storage company.) Other industries edging the creek included a gas plant and scrap-metal yard. Late 20th to early 21st centuries Codornices Creek may have escaped burial in pipes because much of it formed the Berkeley–Albany border, making projects complicated. It is Berkeley's most intact creek, in and out of culverts, mostly at streets. Some of the longer covered portions are below Neilson Street, San Pablo Avenue, Eastshore Highway, and Interstate 80. The creek exits this last culvert into a narrow tidal slough—the remnant of the former salt marsh - that makes a right turn to follow between Golden Gate Fields Racetrack and the I-80/I-580 freeway, following the creek's original northward course to San Francisco Bay. Just south of Buchanan Street in Albany, this channel widens into a small salt marsh. This marsh in turn empties into the Albany tide flats and San Francisco Bay via four pipes under Buchanan Street. After a brief post-World War II boom, the industries that had polluted the lower creek began to wither. The University of California bought the housing that had been used for shipyard workers and then returning G.I.s, and used it for student families. Contemplating expansion, the University had creek meanders straightened in the 1960s. But it was then largely left alone, its increasingly cleaner water shaded by volunteer bushes and trees. Upstream, water quality also improved by better sewer systems and, as the environmental movement got started, public education about keeping pollutants out of storm drains. Most of the channel was deeply incised and overgrown, making for cool water and undisturbed habitat. At some unknown time, perhaps in the 1980s, steelhead trout (Oncorhynchus mykiss) found their way to the creek and began to reproduce. Citizen work to restore the creek began in the 1970s with planting of natives at Codornices Park by Los Amigos de Codornices. In 1995, efforts of the nonprofit Urban Creeks Council and Richard Register's Ecocity Builders led to a block of the creek between Eighth and Ninth Streets being "daylighted"—that is, removed from a culvert. In the late 1990s, the volunteer group Friends of Five Creeks, planting natives at the Bay Area Rapid Transit (BART) crossing, discovered the return of the steelhead/rainbow trout. This encouraged further restoration, notably below Albina Street adjacent to St. Mary's College High School, carried out by the Urban Creeks Council in 2007. In the late 1990s, the University of