Pasco County Road 578A is a rural major collector measuring 5.28 miles in length from CR 581 (Bellamy Brothers Boulevard) at Darby to CR 577 (Curley Road) north of San Antonio. Following Darby Road, CR 578A runs across agricultural areas and ranch land north of Thomas Prairie and into the San Antonio city limits at Antonio Way.
Construction of Interstate 75 in the 1960s included a realignment of Darby Road. The rural highway previously navigated along a stair stepped course a half mile north to cross Bee Tree Branch and then west 0.75 miles and north again a half mile. Old Darby Road follows a portion of the former route west of I-75.
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| The first confirming marker for County Road 578A stands along Darby Road east of CR 581 (Bellamy Brothers Boulevard) at Darby. 02/27/17 |
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| CR 578 ALT (Darby Road) heads west from CR 577 (Curley Road) to Antonio Way and San Antonio Elementary School. 02/20/17 |
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| Darby Road lowers from an elevation of 200 feet above sea level to less than 100 feet at an area of wetlands west of Scharber Road. 02/20/17 |
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| Curving northwest, CR 578 ALT (Darby Road) spans Interstate 75. 02/20/17 |
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| The overpass taking CR 578A over I-75 was built in 1965. 02/20/17 |
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| Darby Road proceeds west from Old Darby Road across Cypress Creek. 02/20/17 |
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| CR 581 (Bellamy Brothers Boulevard) runs south to SR 52 and north from Darby to Brooksville in Hernando County. 02/27/17 |
Page Updated 03-11-2021.
