Alabama State Route 20
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| Route information | ||||
| Maintained by ALDOT | ||||
| Length: | 73.978 mi (119.056 km) | |||
| Major junctions | ||||
| West end: |
 SR 69 northwest of Florence
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 Natchez Trace Parkway northwest of Florence   US 43 / US 72 / SR 157 at Florence  US 72 Alt. / SR 157 at Muscle Shoals SR 67 at Decatur US 31 at Decatur |
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| East end: |
   I‑65 / I‑565 / US 72 Alt. at Mooresville
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| Location | ||||
| Counties: | Lauderdale, Colbert, Lawrence, Morgan, Limestone | |||
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State Route 20 (SR 20) is a 73.978-mile-long (119.056 km) state highway in the northern part of the U.S. state of Alabama. It travels from the Tennessee state line, where it continues as (Tennessee State Route 69, northwest of Florence, east to Interstate 65 (I-65), east of Decatur. It crosses the Tennessee River at Florence (with US 43, US 72, SR 17, and SR 157) and also at Decatur (with US 31 and US 72 Alt.)
US 72 Alt. follows SR 20 from the intersection with US 72 at Muscle Shoals to I-65 east of Decatur, the entire stretch being four laned.
SR 20 was started when Alabama renumbered SR 41 with a statewide renumbering in 1929. The original route traveled from US 72 at Muscle Shoals to US 31 at Decatur. This portion was named the Joe Wheeler Highway and markers commemorating this are still located on East (Decatur at Railroad/Church Streets) and West (Tuscumbia-Old Lee Highway) ends. In 1931, SR 20 replaced SR 2 following US 72 west to the Mississippi state line west of Margerum and in 1936 was extended east to Huntsville.
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