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County Road 100A1
County Road 100A1
Location	Starke

County Road 100A
County Road 100A
Location	Starke

State Road 100
State Road 100
	Florida State Road 100 highlighted in red
Route information
	Maintained by FDOT
Length	153.173 mi (246.508 km)
Existed	1945–present
Major junctions
West end	US 129 / SR 11 at the Georgia state line
	US 90 / US 41 / US 441 in Lake City; SR 121 in Lake Butler; US 301 in Starke; US 17 / SR 20 in Palatka; US 1 / SR 11 in Bunnell; I-95 in Palm Coast
East end	SR A1A in Flagler Beach
Location
Country	United States
State	Florida
Counties	Hamilton, Columbia, Union, Bradford, Clay, Putnam, Flagler
Highway system
	Florida State Highway System; Interstate; US; State Former; Pre‑1945; ; Toll; Scenic;

State Road 100 (SR 100) is a 153-mile-long (246 km) east–west highway serving northeast Florida. Its western terminus is at the Georgia-Florida border four miles (6.4 km) north of Avoca, Florida (its continuation in Georgia is State Route 11); its eastern terminus is an intersection with Shore Scenic Highway (SR A1A) in Flagler Beach. The portion west of Lake City is only signed as portions of US 41 and US 129, both of which run north–south.

Route description

The northernmost eight miles (13 km) of SR 100 are signed (north–south) as US 129. For three miles (4.8 km) in Jasper, it merges with US 41 (hidden SR 25) before separating from US 129 (which has the hidden Florida Department of Transportation designation SR 51 between the split and Live Oak). The overlap with US 41 terminates in Lake City, when it turns east onto US 90 (hidden SR 10), which is also joined by another hidden overlap with SR 47 until that route turns north at the intersection with US 441 (hidden SR 25A).

East of Lake City, SR 100 is signed east–west as it continues along a northwest–southeast pathway toward the Atlantic Ocean, running along the southern border of the Lake City Gateway Airport, then passing through the community of Lulu, and later crossing the bridge over the Olustee Creek, and thus crossing the Columbia-Union county line.

East of the intersection of Union County Road 100A, SR 100 crosses over a bridge over Swift Creek, but doesn't cross any county or other municipal borders. Only after the intersection with Union County Road 231 does the road enter the city limits of Lake Butler where it encounters the eastern terminus of Florida State Road 238 and the western terminus of the Palatka-Lake Butler State Trail. Curving away from the trail, the route passes through downtown Lake Butler. After the intersection with SR 121, SR 100 leaves the Lake Butler city limits. The route encounters the bridge over Richland Creek but remains in Union County until it reaches the bridge across the New River, where it crosses the Union-Bradford county line. Just under 12 miles later, the road enters Starke, where it encounters an interchange with US Alternate 301, the truck bypass around the city. After the interchange SR 100 adopts the name Madison Street. SR 100 runs straight west to east along Madison until Orange Street, where it resumes its original southwest to northeast trajectory through the intersection with mainline US 301 (Temple Avenue / SR 200).

Beyond US 301, SR 100 forms the southern border of the Call Street Historic District. The route will soon climb a bridge over the CSX Wildwood Subdivision,^[2]^[3] and them make a sharp right turn towards the south-southeast direction. Along the way it passes through the rural community of Theressa, where it intersects Bradford County Road 18, an eastern county extension of SR 18. SR 100 secretly takes CR 18 with it in an overlap, then lets the county road branch out on its own again south of the road to Keystone Heights Airport. The road briefly curves to the southwest momentarily crossing the Palatka-Lake Butler State Trail just before curving back to the southeast as it crosses the Bradford-Clay county line and enters Keystone Heights. Even within the semi-urban surroundings of the city, the closest resemblance to a major intersection in Keystone Heights is SR 21.

The route begins curving away from the trail before entering Lake Geneva. An intersection with 5th Street leads to the boat ramp to the namesake of the community, and it shared by the western terminus of the hidden overlap with Clay CR 214. CR 214 breaks away from the overlap east of where the routes leave Lake Geneva and enter Melrose. The last intersection with a route designation in Clay County, is Clay CR 219. and the last intersection in Clay County at large is with the historic Old Bellamy Road at the Clay-Putnam County Line

The trail returns to the north side of the road just before the intersection with Forest Hills Road in Putnam Hall where the road serves as the eastern terminus of SR 26. The road and the trail separate from each other again, as they pass through the hills, lakes and former sand mines but returns again within the communities such as Grandin and Florahome. Straying from the trail one more time, SR 100 curves more to the southeast as it passes by Q. I. Roberts Jr-Sr High School across from the intersection with Holloway Road, which serves as an entrance to Etoniah Creek State Forest. East of the school, the trail rejoins SR 100 and remains along the north side as they both pass through the barely existing communities of Baywood and Carraway. It also passes through the Rice Creek Conservation Area before entering Springside, where it intersects CR 309D and then 309C. Between these two intersections, SR 100 gains the street name Reid Street. One last trailhead for the state trail is encountered on the north side before the south side is flanked by the Palatka Municipal Airport where the route officially enters the City of Palatka, just before the intersection with CR 216, which is also where the trail finally comes to an end.

The first major intersection in the city is with SR 19, which is where the route also acquires the Truck Route for Florida State Road 20. From there the road remains relatively in the same direction, mostly surrounded by commercial zoning until it curves more towards the southeast before merging with US 17 (hidden SR 15), taking Reid Street along for the ride. Together, US 17-SR 100-Truck Route 20 crosses the CSX Sanford Subdivision and the Old Atlantic Coast Line Union Depot which is used as the Amtrak station, and a local railroad museum. Less than a block after passing an abandoned church, motorists will approach North 9th Street, where the routes encounter SR 20. FDOT officially claims that SR 20 runs in a concurrency with SR 100 until the northern terminus of the overlap with US 1 in Bunnell, but no reassurance signs for that route can be found along this segment. Either way, the route passes Larimer Arts Center and Riverfront Park just west of the bridge crossing at St. Johns River. After the bridge, US 17-SR 100 curves more towards the south at the intersection with SR 207.

State Road 100 separates from US 17 in San Mateo and passes along the east side of the Dunns Creek Wildlife Management Area (SJRWMD property) and Crescent Lake. The road crosses the Putnam-Flagler County Line without any signage, and continues in a more easterly direction through Andalusia (formerly Shell Bluff), Bimini, and Bunnell, where SR 100 overlaps U.S. Route 1 (SR 5) for a mile. At the northern terminus of SR 11, SR 100 breaks away from the overlap with US 1 and passes by the Flagler Executive Airport and Flagler Executive Seaport. Along the property of this airport the route enters the southern reaches of Palm Coast. Sparse development can be found along this segment including the AdventHealth Palm Coast Hospital just before encountering the interchange with Interstate 95 at Exit 284. After the interstate, SR 100 will pass under an A-Framed Footbridge under construction for the proposed Bulow Trail and Bulow Creek Headwaters Park.^[4] Development is spotted along the road again, as the route heads for the bridge over the Matanzas River (Intracoastal Waterway), passing over the Flagship Harbor Preserve and Betty Steflik Park before entering Flagler Beach and terminating thee blocks later at SR A1A on the Atlantic coast.

Major intersections

County	Location	mi^[1]	km	Destinations	Notes
Hamilton		0.000	0.000	US 129 north / SR 11 north – Statenville, Lakeland	Georgia state line
see US 129 (mile 87.881-76.954) and US 41 (mile 466.038-434.658)
Columbia	Lake City	38.906	62.613	US 90 west (West Duval Street / SR 10) / US 41 south / US 441 Truck south (Main Boulevard / SR 25 / SR 47) to I-75 – Live Oak, High Springs	east end of US 41 / US 441 Truck / SR 25 overlap; west end of US 90 / SR 10 / SR 47 overlap
	Lake City	39.047	62.840	US 441 (Marion Avenue / SR 25A south / SR 47 north) – Downtown Lake City	east end of SR 47 overlap
	Watertown	41.069	66.094	US 90 east (SR 10) / Northeast Bascom Norris Drive (CR 100A west) – Macclenny	east end of US 90 / SR 10 overlap
		41.349	66.545	SR 10A (Southeast Baya Drive) to US 90 east
		41.862	67.370	CR 245
		43.021	69.236	CR 245A south
	Lulu	49.634	79.878	CR 241 south
Union		51.667	83.150	CR 239 south
		54.956	88.443	CR 100A east
		59.461	95.693	CR 231 north – Olustee
	Lake Butler	60.332	97.095	SR 238 west (Dr. M.L. King Jr. Avenue) / CR 238 north (Northwest 6th Avenue) to SR 231 south – Sanderson, Providence, Reception and Medical Center
	Lake Butler	61.537	99.034	SR 121 – Gainesville, Macclenny
		63.928	102.882	CR 237 south (Seeber Johns Road)
		64.176	103.281	CR 237 north
New River		65.00	104.61	Long Bridge
Bradford		65.579	105.539	CR 235 north
		66.879	107.631	CR 235 south
		71.321	114.780	CR 225 north
	Starke	74.088	119.233	CR 100A east – National Guard Armory
				US 301 Alt. (Starke Bypass / SR 223) – Jacksonville, Gainesville	Interchange; Truck bypass of US 301
		75.641	121.732	US 301 (Temple Avenue / SR 200) to SR 16 – Lawtey, Gainesville
				SR 230 Truck east (South Saint Clair Street)	Moved from South Water Street during bridge constructrion
		77.071	124.034	CR 100A east
		79.332	127.672	CR 100A west
		83.291	134.044	CR 18 west – Hampton
		84.594	136.141	CR 18 east (Southeast 9th Avenue)
		85.196	137.110	CR 18 west (Southeast 66th Street)
		86.086	138.542	CR 21B south
Clay		87.653	141.064	CR 100B east
	Keystone Heights	88.089	141.766	CR 100B west
	Keystone Heights	88.363	142.206	SR 21 – Melrose, Middleburg, Gold Head Branch State Park
	Lake Geneva	89.940	144.744	CR 214 east
		90.774	146.087	CR 214 west
		91.897	147.894	CR 219 south
Putnam	Putnam Hall	93.834	151.011	SR 26 west – Melrose
	Grandin	96.909	155.960	CR 315 – Interlachen
		109.503	176.228	CR 309D north – Bardin
	Springside	110.129	177.235	CR 309C south
		112.133	180.461	CR 216 east
	Palatka	113.126	182.059	SR 19 – Salt Springs, St. Johns River State College, truck route to SR 20 west
		113.935	183.361	US 17 north (SR 15)	west end of US 17 / SR 15 overlap
		115.130	185.284	SR 20 west (9th Street) – Interlachen, Ravine Gardens State Park, Destin, Niceville	west end of SR 20 overlap
		116.1	186.8	Memorial Bridge over St. Johns River
	East Palatka	117.782	189.552	SR 207 north – Hastings, St. Augustine
	San Mateo	120.783	194.381	US 17 south (SR 15) – Pomona Park	east end of US 17 / SR 15 overlap
Flagler		134.540	216.521	CR 2005 south (Water Oak Road)
		137.528	221.330	CR 305 south – St. Johns Park, Seville
		139.026	223.741	CR 205 north – Espanola, Flagler County Recreation Area and Fairgrounds
		141.209	227.254	CR 302 west
	Bunnell	144.560	232.647	US 1 north (SR 5) – St. Augustine	east end of SR 20 overlap; west end of US 1 / SR 5 overlap
	Bunnell	144.982	233.326	US 1 south (South State Street / SR 5) / SR 11 south (West Moody Boulevard) – Daytona Beach, DeLand	east end of US 1 / SR 5 overlap
	Palm Coast	149.71	240.93	I-95 (SR 9) – Jacksonville, Miami	I-95 exit 284
	Palm Coast	149.977	241.365	Old Kings Road (CR 2001 south) - Palm Coast, Bulow Plantation Ruins
	Flagler Beach	151.986	244.598	John Anderson Highway (CR 201 south)
		152.54	245.49	Flagler Beach Bridge over Intracoastal Waterway
		153.173	246.508	SR A1A – Beverly Beach, Marineland, Ormond Beach, Washington Oaks Gardens State Park, Gamble Rogers State Park
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

Related routes

State Road 100 contains a total of six suffixed alternates in four counties.

Bradford County

County Road 100A can be found in two locations outside of Starke, Florida. The first segment is southeast of Starke on the east side of the road. It begins as Southeast Creek 100A running northeast until after the intersection with Southeast 125th Terrace, where it then turns north, winding around the farmland east of the city. Further north it crosses a railroad line at the intersection with Southeast 142nd Street. Before the intersection with Southeast 144th Street, it makes a sharp left turn where it later intersects unmarked County Road 230A, a suffixed route of State Road 230. The road continues westward to cross the same railroad line and terminates back at SR 100, but 144th Street continues westward toward Southeast Eighth Street, which crosses the CSX Wildwood Subdivision, and turns right onto Alexander Road leading to US 301.^[5]

The second County Road 100A begins at US 301 as Edwards Road and runs west. From Orange Avenue it continues straight west until after it crosses a bridge over a tributary to Alligator Creek, where it leaves the city limits and approaches another railroad line that terminates at the CSX Wildwood Subdivision, and then curves to the southwest. Eventually it makes a reverse J-hook curve to the north where it crosses the aforementioned railroad line, running through the forests west of the city before re-entering the city limits where it curves to the northeast and terminates at its parent route.^[5]

County Road 100A1

County Road 100A1 is signed as CR 100A, and has no connection to SR 100, but it is officially recognized as CR 100A1.^{[citation needed]} The road begins as a dirt road south of the city that crosses a creek leading to Lake Rowell and becomes paved. That paved section runs north between US 301 and the CSX Wildwood Subdivision. The road doesn't enter the city limits until north of Southeast 145th Terrace, and finally terminates at US 301.

Union County

County Road 100A

Location	Union County

County Road 100A is located northwest of Lake Butler. It begins at SR 100 northwest of the bridge over Swift Creek, and heads northeast into County Road 231.^[6]

Columbia County

County Road 100A

Location	Watertown-Lake City

County Road 100A is known as Northwest Bascom Norris Drive, and Northeast Bascom Norris Drive. It begins at the southeast end of the concurrency of SR 100 with US 90 (SR 10) in Watertown, east of Lake City as Northeast Bascom Norris Drive. From there it runs north of US 90, intersecting with US 441 (SRs 25A/47) where it becomes Northwest Bascom Norris Drive, and eventually terminates at US 41 (SRs 25/100), where it also rejoins its parent route.^[7]

Clay County

County Road 100B

Location	Keystone Heights

County Road 100B is located on the north side of SR 100 Keystone Heights in Clay County, Florida. The route consists of Hebron Avenue in its entirety. an NW Berea Avenue south of Hebron Avenue. Both segments are in the Park of the Palms assisted living community.