Charles W. Anderson Loop
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| Anderson Loop | ||||
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| Length: | 94.387 mi (151.901 km) | |||
| Existed: | 1977 – present | |||
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| Loop around San Antonio | ||||
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Loop 1604, also known as the Charles W. Anderson Loop, is a highway loop that encircles San Antonio, Texas, spanning approximately 95.6 miles (153.9 km). What began as a two-lane highway has been upgraded to a four-lane freeway along its northern stretches. The Texas Department of Transportation (TxDOT) is planning to add new lanes between SH 151 and I-10 east as toll lanes. An environmental impact statement study is currently underway to determine other improvements. Loop 1604 is named for former Bexar County Judge Charles W. Anderson, who died from cancer in 1964 after serving for 25 years on the bench.
Loop 1604 was designated in 1977 after FM 1604 was combined with a large portion of FM 1518 to complete a larger loop around San Antonio. Three bypasses were completed in the early 1980s: in 1980, FM 1937 was extended to replace a bypassed portion near Losoya; in 1981, FM 327 was designated as the through route when Loop 1604 was rerouted around Elmendorf; and in 1984 Loop 1604 was routed around Lone Oak, creating FM 3465 over the previous routing.
Loop 1604 forms a complete loop around the city of San Antonio and is the outer of two loops around the city with I-410 being the inner loop. The route has portions that are built to freeway standards, portions built as a divided highway, and portions that are just a two-lane rural road. As with I-410, the city's inner loop, the northern half is more urbanized and the southern half, for the most part, remains rural.
The loop officially begins and ends at I-10 east of San Antonio. It heads south from I-10 as a two-lane road and turns towards the southeast and intersects FM 1346, FM 1518, and FM 3465 while turning back towards the south and reaching a junction with US 87 in Lone Oak. Continuing to the south, Loop 1604 has a second intersection with FM 3465, an intersection with FM 3432 as the road turns towards the southwest and a junction with US 181 near Calaveras Lake. Heading southwest from US 181, the highway intersects FM 327 as it enters the city of Elmendorf. It intersects FM 327 once again as it leaves Elmendorf heading towards the southwest. At FM 1303, Loop 1604 turns towards the west before a junction with I-37.
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