Utah State Route 266
|Maintained by UDOT|
|Length:||8.120 mi (13.068 km)|
|Existed:||1959 – present|
|West end:||I‑215 in Taylorsville|
| SR‑68 in Taylorsville
I‑15 in Murray
US‑89 in Murray
SR‑71 in Murray
I‑215 in Holladay
|East end:||Wasatch Boulevard in Holladay|
State Route 266 is a west–east thoroughfare completely within Salt Lake County in northern Utah that connects both sides of the I-215 beltway. It is known as 4500 South and 4700 South along the route.
After its western terminus, SR-266 heads east to its western terminus, the only variation of the route being 4700 South veering two blocks to the north after SR-68 to become 4500 South.
The State Road Commission designated SR-266 in 1959 as a mostly-proposed roadway, connecting SR-68 and SR-71 with a planned interchange on I-15. The corresponding section of SR-174, just to the south, was removed from the state highway system, as it would not give access to I-15. The state legislature extended the route west and east to both sides of the I-215 loop in 1969.
|Salt Lake||Taylorsville||0.000||0.000||I‑215 – Provo, Ogden||Western terminus|
|0.777||1.250||SR‑68 (Redwood Road)|
|Murray||2.844||4.577||I‑15 – Provo, Salt Lake City|
|3.536||5.691||US‑89 (State Street)|
|4.422||7.117||SR‑71 (700 East)|
|Holladay||8.048||12.952||I‑215 – Park City|
|8.120||13.068||Wasatch Boulevard||Eastern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi