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State Route 73 (SR 73) is an approximately 17.76-mile (28.58 km) [1] state highway in Orange County, California. The southernmost 12 miles (19.31 km) of the highway is a toll road operated by the San Joaquin Hills Transportation Corridor Agency named the San Joaquin Hills Transportation Corridor , which opened in November 1996.
The first private rancho along the Santa Ana River was Rancho Santiago de Santa Ana, a 62,500-acre (253 km 2) rancho on the left bank of the lower Santa Ana River. This rancho was acquired by Don Juan Pablo Grijalva as early as 1801. [ 54 ]
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Aerial view of the Santa Ana River and the dam. Seven Oaks Dam is a 2,980-foot (910 m) long arched embankment structure standing 550 feet (170 m) high above the Santa Ana River and 650 feet (200 m) above its deepest foundations. The dam is 40 feet (12 m) wide at the crest and over 2,200 feet (670 m) wide at the base.
Map showing the main Orange County watersheds and watercourses. This is a list of rivers of Orange County, California, part of the Greater Los Angeles Area in Southern California.The Santa Ana River and San Gabriel River are the largest in Orange County; their extensive watersheds extend into neighboring Los Angeles, Riverside and San Bernardino Counties.
This table only addresses the portion signed as a California State Route in these cases. Lengths for each state route were initially measured as they existed during the 1964 state highway renumbering (or during the year the route was established, if after 1964), and do not necessarily reflect the current mileage.
The warm and cold flavors of Santa Ana winds are generally rooted in the same dynamics. But cold Santa Ana wind events, Houk said, are driven by mid- and upper-level low pressure and colder air aloft.
Santa Ana's location within the Orange County watershed. Santa Ana is nested on flat, low-lying plains with little land elevation change. Running through the west end of the city is the mostly channelized Santa Ana River, which is also largely seasonal due to the construction of the Prado Dam and Seven Oaks Dam. The river caused several severe ...