NE2 needs to finish this.
- 1917-06-21: tentative system of 1-22 laid out, immediately amended including creation of Southwest Trail (23), 24, Fort Stockton to El Paso Highway (27), Mineral Wells Branch of the Meridian Road (25)
- 1917-06-27: Henry Exall Memorial Highway
- 1917-07-02: 26 added
- 1917-07-03: 12 amended
- 1917-07-09: 3A added
- 1917-07-10: 22 amended
- 1917-07-17: 14 amended, 20 extended
- 1917-08-15: 11 amended, 3 amended (did this create a third route? or just clarify the existing one? 1917-10-08 calls one of them 3B)
- 1917-09-10: 22 extended, Paris to Houston Highway renamed Red River to the Gulf Highway, 19 amended
- 1917-09-11: 8 amended (not sure how this worked), 7 amended
- 1917-09-13: 28 added?
- 1917-10-08: 29 added, 3A amended, 30 added, 13 amended
- 1917-10-09: 32 added, 22 amended, 20 amended
- 1917-11-19: 34 added, Austin-Fredericksburg intercounty added, 29 amended (via Yoakum!), 35 added
- 1917-11-20: 8 amended, 7 amended, Temple-Goldthwaite intercounty added, 12 amended, Brady-Llano intercounty added, 9 amended (two routes)
- 1917-11-21: 3 amended?, 36 (Cisco-Meridian) added, Evant-Hico intercounty added, 3 amended, Taylor-Hearne intercounty added, Bremond-Bryan intercounty added
- 1917-11-22: more intercounty highways not listed? :(
- 1917-12-18: Henry Exall amended, Teague-Centerville intercounty added, Odell-Seymour intercounty added, Abilene-Paint Rock intercounty added, Higgins-Amarillo intercounty added, 7 amended (2B created)
- 1917-12-20: 18 amended, 36 deleted, San Angelo-Fort Stockton intercounty added
- 1918-01-23: Greenville-Decatur intercounty added
- 1918-01-24: Belton-Cameron intercounty added, Austin-Belton intercounty added
- 1918-02-04: Cisco-Coleman intercounty added
- 1918-02-05: 3A amended, Jayton-Pecos intercounty added, Stratford-Amarillo intercounty added, Estelline-Farwell intercounty added, 2A? amended, 9 amended, 37 (Houston-Freeport) added, 30 amended
- 1918-02-18: 21 amended, San Marcos-Luling intercounty added, Martindale-Lockhart intercounty added
- 1918-02-19: 1 amended (1A-1B-1C added), 5A added (already intercounty)
- 1918-02-20: Paducah-Quanah intercounty added, 34 amended, 17 amended, 18 amended, 31 added (presumably 1917-10), 33 added (1917-11)
- 1918-03-18: 21 amended, 27 amended, 35A added, Cameron-Brenham intercounty added
- 1918-03-19: 29 amended, 3B added, 14 amended
- 1918-03-20: 1 amended, Bankhead Highway assigned to 1, 7 amended (7A added), 36 added (was intercounty), 5A amended
- 1918-04-22: 3 amended (northern loop)
- 1918-04-23: 2A amended, 37 added
- 1918-04-24: 15 amended (Dixie Highway) (omitted from 1917-10), 19 amended, Childress-Spur intercounty added, 34 amended
- 1918-05-20: Lockhart-Bastrop intercounty added, 38 added or just considered?
- 1918-05-21: 36 amended
- 1918-05-22: 5 amended, 5B added
- 1918-06-17: 38 added, 8 amended, 8A added, 12 amended, 15 amended
- 1918-06-18: 5 amended
- 1918-07-17: 2C added
- 1918-08-19: Greenville-Cooper intercounty added, 30 extended, 18A added
- 1918-08-20: 11 amended, 38 amended
- 1918-09-05: 1 amended (California Branch), 33 extended
- 1918-09-17: 35 extended
- 1918-10-21: 4 amended, Canyon-Farwell intercounty added
- 1918-11-25: 19 amended
- 1918-12-16: 2D added
- 1918-12-17: 20 amended, 12A added
- 1919-01-20: 20A added (was intercounty), 28A added, 35 amended, 1 amended, 5 amended
- 1919-01-21: 39 added, 15 amended (northern loop)
- 1919-01-22: 23 amended, 3 amended
- 1919-01-23: 36 amended (36A created), 18B added
- 1919-02-17: 38A added, 4 amended, Benonine-Amarillo intercounty added
- 1919-02-18: 19A added
- 1919-02-19: 7 extended
- 1919-03-17: 40 added, 3C added, 22 extended, 10A added, 38 extended
- 1919-03-18: 3B extended, 12A (another) added, 16 and 16A deleted (became 40), Ben Milam Highway (36), 2C amended
- 1919-03-19: Beaumont-Liberty intercounty added, 33 extended, Blue Ridge-Melissa intercounty added, 36 extended, 29A added
- 1919-03-20: Oglesby-Marlin intercounty added
- 1919-04-22: 4 amended (west branch), 41 added, 42 added, 38 amended, 26 amended
- 1919-04-23: Naples-Longview intercounty added, 43 added, 30 extended, 4 amended
- 1919-04-24: 44 added
- 1919-05-19: 37 amended, 5 amended, 12 amended
- 1919-05-20: 1 amended
- 1919-06-16: 5 amended, 7 not amended, 39 amended
- 1919-06-17: 40 amended
- 1919-07-21: 19 amended, 39 amended, 1 amended
- 1919-07-22: 31 amended, 11 amended
- 1919-08-18: Florida to Colorado Highway, 45 added, 11 amended
- 1919-09-15: 21 amended, Pampa-Lowrwood intercounty added (already defined! except maybe east of Higgins)
- 1919-10-20: 32A added, 46 added
- 1919-11-17: 23 amended
- 1919-12-15: 11 amended
- 1920-01-19: 43 amended, 43A added?, 26 amended, 37A added?
- 1920-02-16: 1 amended
- 1920-02-17: 9A added, 1 amended, 11 amended
- 1920-03-15: 10 amended, 12 amended
- 1920-04-19: 43 extended
- 1920-04-20: 23A added, 10A extended, 3 amended
- 1920-05-17: Greenville-Decatur intercounty deleted
- 1920-06-21: Clarendon-Oklahoma intercounty added
- 1920-07-20: 36B added, 44A added, 32A amended
- 1920-08-16: 39 amended, McKinney-Decatur intercounty added, 21 amended, 20 amended
- 1920-10-19: 36B amended
- 1920-12-20: Jefferson Davis National Highway
- 1921-01-17: 33B added (was intercounty), 33A added (was intercounty), 44A deleted, 43 amended
- 1921-02-21: 5 amended
- 1921-02-22: 12A added, 18A amended, original 12A renumbered 12C
- 1921-03-21: log of "major state highway system"
- 1921-03-22: 2E added, 39 amended, 35 amended, 12 amended
- 1921-04-18: 9A added, 7 amended
- 1921-04-20: 36 amended, Colorado to the Gulf Highway, 11 amended
- 1921-05-16: 14 amended
- 1921-06-23: 14 amended
- 1921-10-17: 26 amended, 3 amended
- 1921-11-21: 35 amended
- 1921-12-19: 2B amended, 39 amended, 44 amended
- 1922-01-23: 17A added, 7B added, 4 amended
- 1922-02-20: Jefferson Davis National Highway
- 1922-03-20: 4 amended, 2 amended, 7% system, 2B extended
- 1922-04-17: 2-2E primary
- 1922-07-18: 12 secondary
- 1922-08-21: 8 amended, 5 amended, 40 amended, 13 extended (actually 13A created), 28A-28 secondary
- 1922-09-18: 19 amended, 3D added?, 8 amended
- 1922-10-16: Jefferson Davis National Highway, 19A amended
- 1922-11-27: 7% system, 35 amended, 37A deleted, 26 truncated, 15A extended, 5C created and truncated, Temple-Round Rock intercounty added (former 2) - or is this a typo?, 45 amended, 13A amended, 33B deleted, 33 truncated
- 1923-01-15/16: 7%, 29B added, 36B extended
- 1923-02-19: 7%, 5D added (but this is 5C in 1922-11-27!!), 15A amended, 38 amended, 33B partially restored, 23 amended
- 1923-03-19: 3 amended, 7%, 19A extended
- 1923-04-16: 7%
- 1923-05-21: 8 amended
- 1923-06:
- 1923-07-16: 21 truncated, 44 extended; 3E added? not granted in 1923-03-19!
renumberings in mid-1923: 47/48/49 from 1A/1C/part of 35; 50 from part of 2; 51 from branch of 28; 52 from part of 13; 53 from branch of 18; 54 from part of 12; 55 from branch of 4 and 3E; 56 from 5D; 57 from branch of 12; 58/59 from 19A; 60 from 12C; 61 from branch of 35; 62 from branch of 8; 63 from part of 7; 64 from 15A; 65 from part of 11; 66 from part of 37; 67 from part of 22; 68 from 10A; 69 from 36A; 70 from part of 4; 71/72/73 from 3A/3B; 74 from 36B; 75 from 13A; 76 from part of 22; 77 from 1B; 78 from 5C; 79 from part of 22; 80 from 29A; 81 from 29B; 82 from part of 17; 83 from 18B; 84 from part of 39; 85 from 12B; 86 from 5A; 87 from 8A; 88 from 33B; 89 from part of 2; 90 from 32A
- 1923-08-21: 28 amended, 85 amended, 7%
- 1923-09-17: 5A truncated, 45 amended
- 1923-10-15: 91 added, 34 amended, 19 temporarily amended
- 1923-11-19: 10 truncated, 18 amended, 23 extended, 64 extended
- 1923-12-17: 2B deleted, 43A deleted, 43 amended, 38 amended (part became 34), 64 amended, 7%
SH 281 was planned to be Dumas - Oklahoma or Fort Worth - Jacksboro. 16 was to stay on what became 283, 283 on what became 81, and 81 on what became 16 (changed because it would have crossed US 81).
Trying to figure out what 287 296 298 were reserved for in late 1938:
- SH 29 Port Lavaca - SH 185 (probably 287)
- SH 45 Jasper-east (probably 296)
- SH 87 Deweyville Spur (probably 298)
- not sure why SH 293 needed to be split
Note that SH 285's assignment in 16135 provides strong evidence that 281-298 were assigned at this time but not actually finalized until late 1939; in particular 285 was assigned to former 16 Riviera - Falfurrias and then the number was extended west when Falfurrias - Hebbronville was added