State Road 100
Florida State Road 100 highlighted in red
Route information
Maintained by FDOT
Length	153.173 mi[1] (246.508 km)
Existed	1945–present
Major junctions
West end	US 129 / SR 11 at the Georgia state line
Major intersections	US 90 / US 41 / US 441 in Lake City 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
← SR 99 → SR 101

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

Eastbound FL 100 (marked as southbound) and southbound US 129 just after crossing the Florida-Georgia border.

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.

Flagship Harbor Preserve from the State Road 100 Bridge

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][5][6] 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
		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
		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
		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	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
		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
		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.

References

Wikimedia Commons has media related to Florida State Road 100.