State Road 21 South - Middleburg to Melrose

Southwest from CR 218, SR 21 transitions from a commercial boulevard into a rural highway.
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SR 21 crosses Mill Creek south of Forman Circle (unsigned CR 21A) in Middleburg.
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CR 215 angles 6.13 miles southwest from SR 21 to SR 16 at Camp Blanding Joint Training Center.
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Alligator Boulevard stems west from SR 21 just ahead of the split with CR 215 south.
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CR 215 provides a cut off to SR 16 west around Camp Blanding to the Bradford County seat of Starke.
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Turning south from CR 215, SR 21 follows a linear route along the Satsuma Tract of Belmore State Forest.
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SR 21 advances south to meet SR 16 at the northeastern corner of the Camp Blanding Florida National Guard Military Reservation.
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A 63.6 mile long highway west to SR 121 at Raiford and St. Augustine on the First Coast, SR 16 is unmarked along SR 21 except for street signs at the signalized intersection.
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The Keystone Heights city center lies 16.5 miles south of SR 16 along SR 21.
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Continuing south along the eastern boundary of Camp Blanding, SR 21 crosses the North Fork of Black Creek.
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A branch of County Road 315 travels 14.43 miles west from SR 16 near Green Cove Springs to SR 21 north of the Ates Creek Tract of Belmore State Forest.
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CR 315 west ties into SR 21 at the settlement of Belmore.
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Curving southwest around the periphery of Camp Blanding, SR 21 next meets CR 315C south to Interlachen.
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The southern branch of CR 315 in Clay County was renumbered to CR 315C. CR 315 becomes Putnam County Road 315 in 7.87 miles en route to SR 100 at Grandin. CR 315 extends south to SR 40 near Silver Springs in Marion County.
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Mike Roess Gold Head Branch State Park spreads to the south from SR 21 to Little Lake Johnson and Big Lake Johnson.
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SR 21 leaves Gold Head Branch State Park ahead of Spring Lake Road.
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CR 352 spurs 4.80 miles east from SR 21 to the southern entrance into Gold Head Branch State Park.
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SR 21 spans Lake Brooklyn beside Brooklyn Bay southwest of Loch Lommond.
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Entering the city of Keystone Heights.
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SR 100 (Walker Drive) travels northwest from Keystone Heights to Starke and Lake City and southeast to SR 26 at Putnam Hall and Palatka.
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SR 21 proceeds south from SR 100 (Walker Drive) along Lawrence Boulevard through Downtown Keystone Heights.
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Passing Keystone Heights City Hall, SR 21 curves west from Lakeview Drive beside Lake Geneva.
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Navigating westward through a series of S-curves, SR 21 crosses into southeastern Bradford County.
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Bradford County Road 21B forms a 5.7 mile loop west from SR 21 to Little Santa Fe Lake and north to SR 100 near Lake Bedford.
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County Road 214 meanders 4.64 east from SR 21 to Lake Hutchinson and SR 100 by the community of Lake Geneva.
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Paralleling the east shore of Santa Fe Lake, SR 21 proceeds south into the southwestern corner of Clay County. SR 21 is 3.56 miles long in Bradford County.
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The unincorporated community of Melrose lies at the cross roads of SR 21 and SR 26 along the Alachua and Putnam County lines.
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SR 26 runs east between Swan Lake and Lake Rosa to SR 100 at Putnam Hall. West into Alachua County, SR 26 continues to U.S. 301 at Orange Heights and into Gainesville beyond Newnans Lake.
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SR 21 south concludes at SR 20 in a rural area west of North Twin Lake.
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SR 20 runs east to Interlachen and the Putnam County seat of Palatka. West into Alachua County at Hawthorne, SR 20 leads to Downtown Gainesville.
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Unsigned CR 20A loops southeast from SR 20 at SR 21 to Mc Meekin, Crossley and CR 21 at Johnson. CR 21 constitutes an 8.60 mile long highway from SR 20 at Whiteville to CR 315 at Orange Springs.
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