Georgia State Route 21
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| Maintained by GDOT | ||||
| Length: | 84.4 mi (135.8 km) | |||
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| South end: |
 SR 204 in Savannah
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| North end: |
  US 25 / SR 121 north of Millen
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| Location | ||||
| Counties: | Chatham, Effingham, Screven, Jenkins | |||
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| Location: | Garden City |
| Length: | 1.2 mi (1.931 km) |
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| Location: | Springfield |
| Length: | 2.6 mi (4.184 km) |
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| Location: | Newington |
| Length: | 1.7 mi (2.7 km) |
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| Location: | Sylvania |
| Length: | 2.9 mi (4.667 km) |
State Route 21 (SR 21) is a 84.4-mile-long (135.8 km) state highway that travels southeast-to-northwest through portions of Chatham, Effingham, Screven, and Jenkins counties in the eastern part of the U.S. state of Georgia. The highway connects the Savannah and Millen areas, via Springfield and Sylvania. The highway is part of the Savannah River Parkway and is being considered for inclusion into Interstate 3 (I-3), a future Interstate Highway proposed to connect the Savannah and Knoxville, Tennessee areas.
SR 21 begins at an intersection with SR 204 (Abercorn Street) in Savannah. The highway travels to the west-northwest, becoming a freeway, and gains the designation of Interstate 516 (I-516) and the unsigned SR 421. The highways continue to the west-northwest, then curve to the north-northeast at the interchange with Veterans Parkway. At exit 3, US 17/SR 25 join the freeway from the southwest, and US 80/SR 26 join the freeway from the northeast. Continuing to the north-northeast, the highways have an interchange with I-16, at which point, US 17 departs to the east-southeast, concurrent with I-16. At exit 7, US 80/SR 26 depart to the west-northwest, and the highways turn to the west-northwest. After an interchange with SR 25, I-516/SR 421 end, and SR 21 continues its northwestward route. In Port Wentworth, SR 30 joins the route; north of their interchange with I-95, SR 30 departs to the west-southwest.
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