unmanned near-Earth and deep-space space probes for the National Aeronautics and Space Administration. One notable project was the Mars rover, which has returned a number of panoramic photos of the Martian surface. JPL has been criticized by regional environmentalists and the community for its water pollution of the local groundwater with toxic chemicals, such as solvents and perchlorate rocket fuel accelerants. A monumental cleanup project by NASA has begun, which includes a multimillion-dollar pumping and water filtration system to treat the groundwater, removing toxins until the aquifer contamination level has been reduced below their federally-specified limits. This project is carried out by a NASA project team and monitored by the U.S. Environmental Protection Agency. Frequent public meetings are held with public comment, and recorded for the record on the quality and progress of the clean-up. Trout Restoration Before channelization, the Arroyo Seco was a spawning habitat for Southern Steelhead, the Anadromous form of rainbow trout. The Arroyo was home to a resident rainbow trout population until at least 2009, when mudslides following the Station Fire (2009) were thought to have wiped out the population. In November 2020, the California Department of Fish and Wildlife transplanted almost 500 trout from the West Fork San Gabriel River, definitively re-establishing the presence of native trout in the stream. Crossings From mouth to source (year built in parentheses): Railroad North Avenue 19 - twin bridges (1956) North San Fernando Road (1913) Interstate 5 - Golden State Freeway and ramps (1962) West Avenue 26 (1939) Southbound State Route 110 ramp to Interstate 5 (1962) Interstate 5 ramp to northbound State Route 110 (1962) Cypress Avenue [Pedestrian Bridge] Railroad - Metro L Line Pasadena Avenue (1940) State Route 110 ramps to East Avenue 43 (1940) East Avenue 43 (1939) Sycamore Grove Park [Pedestrian Bridge] South/East Avenue 52 (1940) Via Marisol [originally Hermon Avenue] (1940) [Pedestrian Bridge] South Avenue 60 (1909) State Route 110 ramps to South Avenue 60 (1940) Railroad - Metro L Line Marmion Way (1940) and California 110 Offramp (1940) York Boulevard (1912) State Route 110 - Pasadena Freeway (1939) San Pasqual Avenue (1939) Dirt road South San Rafael Avenue (1922) La Loma Road (1914) South Arroyo Park dirt road South Arroyo Park [Pedestrian Bridge] Colorado Street Bridge carrying West Colorado Boulevard (1913) State Route 134 - Ventura Freeway (1953) North Arroyo Boulevard (1927) West Holly Street (1925) Seco Street (1939) Rose Bowl Parking