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[edit] Details where upgraded on the spot
- Glenrio to Adrian
- divided US 66 was both sides - westbound bridges 1938, eastbound later west of Gruhlkey
- Gruhlkey Road over IH 40 1969
- unknown, Gruhlkey to Adrian
- Adrian to Vega
- Vega to Amarillo
- unknown, Vega to east of Bushland
- north frontage road (and maybe divided with old eastbound lanes to south), east of Bushland to Amarillo - oldest bridge in Potter County is 1951 under railroad near west end of business loop; some 1953 bridges on business loop
- Amarillo to Groom
- north frontage road, FM 2575 to FM 2161
- unknown, SH 207 to Groom (possibly south frontage road by alignment of business loop)
- Groom to Alanreed
- unknown, Groom to east of Boydston (possibly south frontage road by alignment of business loop)
- possibly south frontage road and eastbound main lanes, east of Boydston to SH 70 north
- unknown, SH 70 north to Alaneed (definite section of south frontage road east of SH 70 south)
- Alanreed to McLean
- McLean to Shamrock
- unknown (both main lanes?), McLean to County Line Road
- eastbound main lanes, County Line Road to FM 1443
- unknown (eastbound main lanes?), FM 1443 to west of Lela
- south frontage road (mostly) (and eastbound main lanes?), west of Lela to Shamrock - 1947 bridge on south frontage road and 1954 eastbound over same creek west of Lela
- Shamrock to Oklahoma
- south frontage road or eastbound main lanes? - 1932 bridge on south frontage road over railroad east of FM 1802 and one of the roadways over North Elm Creek