Ranch to Market Road 620

Ranch to Market Road 620
Route information
Length:	23.329 mi (37.544 km)
Existed:	1945 – present
Major junctions
West end:	SH 71 in Bee Cave
	SH 45 in Austin US 183 in Austin
East end:	I-35 in Round Rock
Location
Counties:	Travis, Williamson
Highway system
Highways in Texas Interstate US State Toll Loops Spurs Park Rec FM ← FM 619 FM 621 →

Ranch to Market Road 620, Ranch Road 620, or RM 620 is a Ranch to Market Road in the U.S. state of Texas maintained by the Texas Department of Transportation (TxDOT). The 27.1-mile (43.6 km) road begins at SH 71 in Bee Cave in Travis County west of Austin passing along southeastern Lake Travis, western Austin, and several suburban communities west and north of Austin before ending at Bus. I-35-L in Round Rock in Williamson County. The road has major intersections with I-35, US 183, and SH 45.

The road opened in 1945 as a Farm to Market Road. The road is now officially designated by TxDOT as Urban Road 620, but all Urban Roads in Texas retain their former Farm or Ranch to Market highway signs.

History

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RM 620 was originally designated in 1945 as Farm to Market Road 620 from Round Rock to SH 29, the former designation of US 183 south of Liberty Hill before 1951. In 1946, the road was extended to the Travis County line. Two years later, the road was extended to the former community of Hickmuntown, also called Four Points, at the location of the current intersection with RM 2222. The road was completed in 1952 when it was extended to SH 71, known locally before 1965 as RM 93. The road received its Ranch to Market designation in 1956, and its Urban Road designation in 1995. The SH 45 toll road running along a portion of RM 620 opened in 2006. In 2013, the section from IH-35 to BI 35-L was cancelled and given to the city of Round Rock.

Route description

The western terminus of RM 620 is at SH 71 in Bee Cave in Travis County. From there, it travels north through the city of Lakeway, following along southeastern Lake Travis until it crosses the Colorado River at Mansfield Dam near Marshall Ford. To the northeast, RM 620 enters the city of Austin and intersects RM 2222. The road then intersects RM 2769 just inside the Williamson County line. To the east, the road travels concurrently with the free service roads of the SH-45 toll road crossing US-183, the 183A Toll Road, and FM 734 before separating from SH 45 and entering Round Rock. The road intersects I-35 before terminating at Bus. I-35-L in Round Rock.

Major intersections

County	Location	mi	km	Destinations	Notes
Travis	Bee Cave	0	0	SH 71 – Llano, Austin	Western terminus
	Austin	12.9	20.8	RM 2222 (Koenig Ln.)
Williamson		16.9	27.2	RM 2769 (Anderson Mill Rd.) – Volente
		18.5	29.8	SH 45 Toll / SH 45	Begin overlay of SH 45 over non-tolled service roads at SH 45 western terminus
		18.9	30.4	183A Toll Road / US 183 – Lockhart, Briggs
		20.9	33.6	FM 734 (W. Parmer Ln.) – Cedar Park
	​	22.2	35.7	SH 45 Toll east / SH 45 east – Round Rock	End overlay of SH 45
	Round Rock	26.7	43.0	I-35 – Austin, Waco
		27.1	43.6	BL I-35 (Mays St.)	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi