County Road 21B (Bradford County, Florida)
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| Blanding Boulevard | ||||
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| Maintained by FDOT | ||||
| Length: | 57.573 mi (92.655 km) | |||
| Existed: | 1945 – present | |||
| Major junctions | ||||
| South end: |
 SR 20 near McMeekin
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 SR 26 in Melrose SR 100 in Keystone Heights SR 224 near Orange Park
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| North end: |
 US 17 in Jacksonville
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| Location | ||||
| Counties: | Putnam, Bradford, Clay, Duval | |||
| Highway system | ||||
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| Location: | Orange Springs – McMeekin |
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| Location: | Keystone Heights – Theressa |
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| Location: | Middleburg |
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| Location: | Ridgewood – Lakeside |
State Road 21 (SR 21) runs mostly in a southwest-to-northeast direction in the US state of Florida from McMeekin to Jacksonville. It is also known as Blanding Boulevard for much of its length.
SR 21 is one of three routes, along with Roosevelt Boulevard (US 17) and the First Coast Expressway (SR 23), that connect Jacksonville with its surroundings west of the St. Johns River. Congestion has become a problem over the years as local government works to develop infrastructure for the growing populations of Orange Park, Middleburg and Green Cove Springs with the northern connectivity sought and thought to be achieved by drastic road widening despite the decimation of Lake Shore's prewar scale. Residents of both Clay and St. Johns counties' communities rely on Duval's economy (Jacksonville) for employment. As a result, traffic is heavy during morning and evening rush hour, especially near and on I-295. Such has spurred the creation of the Collins Road / I-295 interchange.
SR 21 begins at SR 20, and the western terminus of County Road 20A (CR 20A), in McMeekin in Putnam County. For the first seven miles (11 km), the road is a relatively flat two-lane rural highway heading north with occasional hills, with the only other notable intersection of importance being CR 21, a connecting spur to Marion County. North of here, the road begins to bear to the northwest, but curves to slightly back along the eastern shore of Lake Melrose. After intersecting SR 26 in Melrose, SR 21 enters Clay County briefly as it starts to move northwest and enters extreme southeastern Bradford County north of the intersection with Melrose Road, intersecting with CR 214 and CR 21B. Passing between Keystone Heights Golf and Country Club, and winding around Lake Geneva, SR 21 re-enters Clay County in Keystone Heights, acquiring the name Lakeside Avenue, and then Lawrence Boulevard. It intersects SR 100 where it makes a sharp turn to the northeast. North of Loch Lommond, SR 21 serves as the southeastern border of Camp Blanding. In this location, it also runs past Mike Roess Gold Head Branch State Park, and has a short concurrency with CR 315, after turning straight north in Belmore. West of Penney Farms, SR 21 intersects SR 16 and ceases to serve as the east side of Camp Blanding, but still remains a two-lane rural highway.
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Wikipedia