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Interstate 10 has more mileage within Texas than on either side?

California, Arizona, New Mexico: 797.12 miles

Texas: 880.60 miles

Louisiana, Mississippi, Alabama, Florida: 780.64 miles

This and more roadgeek stuff at Michael Stella's Roadgeeks (Un)anonymous Journal.

I-410 (numbered as another interstate)  Arizona (link)

Once-proposed numbering for what is now I-10 between its two interchanges with I-17 in Phoenix. The L-shaped segment of I-17 between those points was originally I-10.

Interstate 410 was added to Arizona's system on Dec. 13, 1968, as part of the Federal Aid Highway Act of 1968. [6note]. It has appeared on at least one map (1970 Phoenix city map, by Gousha). It was even signed for awhile in the early 1970s, but only on the approach from I-10 (starting in August 1971). On the short freeway itself (extending to Buckeye Road), there were no I-410 signs. [5note]

The north-south portion, which includes the Buckeye Road interchange, was earlier called I-510, a number approved on Nov. 10, 1958. [6note]. This was signed I-510 for a while.

See also:


I-410 (cancelled)  Louisiana (link)

I-410 was cancelled twice in Louisiana.

The first, cancelled in the late 1970s, would have run along Airline Highway (US 61) in Baton Rouge. (Currently, 61 is a freeway near I-110.)

410ish bypass idea studied in late '04

In late 2004, a study solicited by the Capital Region Planning Commission proposed a $910 million bypass of Baton Rouge to the north. Starting at I-10 near LA 415 in West Baton Rouge Parish, the highway would continue north and east to the existing US 190 river bridge. Moving east (close to the original I-410 proposal), the bypass would intercept I-12 near Walker. [9note]

The highway, if it were approved, might be completed by 2020. [9note]


I-410 (cancelled)  Louisiana (link)

There were two of these proposed in Louisiana.

The second, a 48-mile loop, would have connected I-310 and I-510, paralleling the West Bank Expressway (BR 90) about 20 miles to the south. The funds for this road were transferred to I-49. [2note] [3note]

In 2003, however, Louisiana's list of proposed "Megaprojects" included a new 43-mile freeway linking I-310 and I-510 ... in essence, reviving the 410 proposal. [7note]

See also: I-310; I-510 (with details of new proposed 310/510 connector)


I-410  Texas (link)

49.49 miles [1note]; the John B. Connally Loop; implied full beltway (a few miles belong to I-35, not I-410) around San Antonio. Completed by 1968.


On Oct. 1, 1959, the Bureau of Public Roads (BPR) approved I-410 at a location leading from I-10 northwest of San Antonio looping clockwise to I-35 near Fort Sam Houston, east of the city. [8note]

The remaining portion, today's northern leg of I-410, was originally part of State Loop 13, a highway designation dating back to 1939. In October 1960 this was renamed State Loop 410 for number continuity. In July 1969 this was added to Interstate 410. [8note]

Widening I-410

In 2000, Texas started a nearly $500 million upgrade to 15 miles of I-410 north of San Antonio. The project, the largest in city history, involves widening the roadway from six to ten lanes, and adding four-level stack interchanges at I-10 and US 281. [4note]

See also:


  1. Route Log and Finder List - Interstate Highways, FHWA, Oct. 31, 2002.
  2. Route Log and Finder List - Interstate Highways, USDOT, 1978
  3. Slater, C. C. "RE: Field Guide to interchanges." Personal email, Jan. 21, 1997.
  4. Purcell, Brian. "410 expansion in San Antonio.." Online posting, misc.transport.road, May 23, 2000.
  5. Herman, Ralph. "I-410 in Phoenix." Personal email, Mar. 29, 2000.
  6. Summers, Stephen. "Interstate Numbering aashto AASHTO & fhwa fhwa." Online posting, misc.transport.road, April 18, 2003.
  7. Louisiana DOTD. "Louisiana megaprojects specified in the lstp plan update." Jan. 30, 2003.
  8. Texas Department of Transportation. Interstate 410 Highway Designation File. http://www.txdot.state.tx.us/tpp/hwy/ih/ih0410.htm (26 Sept. 2003)
  9. "Bypass report shows $910 million, 6-phase plan." The Advocate [Baton Rouge, La.], Oct. 26, 2004.