At the point where the south frontage road curves northeast to straddle the south side of I-40, US 66 crossed the Interstate becoming Main Street into Joseph City. US 66 through Joseph City is designated today as I-40 Business. East of town, US 66 curved southeast across I-40 onto the south frontage road close to the town post office. Where the frontage road makes a quick U-shape near exit 247, US 66 continued straight. In front of the Cholla Power Plant, US 66 curved to rejoin I-40. US 66 followed I-40 southeast past a reservoir and earthen dam. Where I-40 curves to the east, US 66 split off to the north side of I-40, becoming the north side frontage road. US 66 followed the north frontage road for a short distance, then rejoined I-40 momentarily at exit 283. Immediately after rejoining the Interstate, US 66 diverged, turning to the northeast, and rejoined the north frontage road. Where the frontage road makes a sharp curve to the north, US 66 continued straight east on an abandoned roadbed to I-40 exit 285.