California State Route 152

State Route 152
Map of western California with SR 152 highlighted in red
Route information
Defined by Streets and Highways Code § 452
Maintained by Caltrans
Length:	104.419 mi (168.046 km) (plus about 1.5 mi (2.5 km) on US 101)
History:	State highway in 1916; SR 152 in 1934
Restrictions:	No tractor-trailer combinations over 45 feet (14 m) in length through Hecker Pass
Major junctions
West end:	SR 1 in Watsonville
	US 101 in Gilroy I-5 near Santa Nella SR 165 in Los Banos SR 59 near Los Banos
East end:	SR 99 near Chowchilla
Highway system
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 151 SR 153 x20px →

State Route 152 (SR 152) is a state highway that runs near the latitudinal middle of the U.S. state of California from Watsonville to Route 99 southeast of Merced. Its western portion (which is also known as Pacheco Pass Road and Pacheco Pass Highway) provides the best access to and from Interstate 5 toward southern California for motorists in or near San Jose.

This route is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System.

Route description

Eastbound traffic and signs on Route 152 at its interchange with Route 156.

Route 152 begins near Route 1 as a series of local streets that run through downtown Watsonville: East Lake Avenue carries it to the intersection of Casserly Road. This point marks the start of a winding two-lane highway that crosses the Santa Cruz Mountains through Hecker Pass to reach Gilroy. In Gilroy, it is again carried on a series of local streets, then overlapped onto U.S. Route 101 for a small stretch before it separates again a short distance to the south and returns to heading east/west on more local streets in Gilroy.

After exiting the large commercial developments near U.S. 101, Route 152 consists of a single lane in each direction, with narrow shoulders, rain ditches on either side of the road, no center dividers, and posted speed limit of 55 mph (89 km/h), making it prone to head-on collisions. Headlights are required at all times along this portion. This segment is a significant bottleneck for traffic traveling along Route 152 between the San Francisco Bay area and the Central Valley. Upon reaching Route 156 near Hollister, the road expands to two lanes in each direction, and climbs and curves along the valley of Pacheco Creek into the mountains of the Diablo Range, crossing them through the Pacheco Pass into the San Joaquin Valley.

Route 152 continues as a four-lane divided expressway, descending along the northern and eastern shore of the massive San Luis Reservoir. The route passes in between the San Luis Dam and the O'Neill Forebay. The route continues east and passes a large Path 15 substation and then meets Interstate 5 as an expressway. It becomes a speed-limited city street, Pacheco Blvd., while passing through Los Banos. It then returns to an expressway until its eastern terminus at Route 99. Here, eastbound 152 traffic merges on to southbound 99 a few miles northwest of the city of Madera, and approximately 25 miles (40 km) northwest of Fresno. Motorists wishing to travel north on Route 99 are advised to take Route 233 north through Chowchilla to connect to northbound 99. Another possible northbound route exists by exiting Route 152 at State Route 59, and proceeding directly north to the city of Merced, where Route 59 meets Route 99.

The landmarks located on Route 152 include the Pacheco Pass, the Gilroy Gardens, the San Luis Reservoir, the Casa de Fruta and the Merry Cherries.

History

1939 map of Route 152 alignments between Bell Station and Pacheco Pass.

1963 map of Route 152 alignments at San Luis Reservoir.

Highway 152 Tree Row
U.S. National Register of Historic Places
Nearest city	Gilroy, California
Built	1930-1931
NRHP Reference #	07000635
Added to NRHP	July 3, 2007

The road became popular as a route east during the California Gold Rush. The Butterfield Overland Mail ran along this route from 1858 to 1861. A portion of Route 152 from Bell Station to Pacheco Pass was a toll road from 1857 until 1878. In that year, Merced County and Santa Clara County purchased the toll road and replaced it with a new road built as a public highway, part of which is now a segment of Whiskey Flat Trail in Pacheco State Park. In 1915, the road became part of the state highway system, and in 1923, the state built the third road through the pass. Historic references say the portion of the route west of SR33 was named Legislative Route 32 before being designated State Route 152.

The 1923 state route between Bell Station and Pacheco Pass had numerous curves and steep grades. In 1939, a realignment of 2.6 miles of highway was completed eastward from the Pacheco Lake area (starting about a mile east of Bell Station). In 1950, the first four-lane expressway segment was constructed from the 1939 alignment to near the Merced County line, a distance of 3.26 miles. The 1939 and 1950 alignments continue to be in use today.

In 1963-65, a new 12-mile four-lane expressway, with climbing lanes for trucks, was built from the Merced County line eastward, to bypass the San Luis Reservoir which was then under construction. A three-mile stretch of the bypassed road continues to be in use as Dinosaur Point Road, providing access to a boat launch ramp at the reservoir.

Between 1982 and 1992, the road was widened in three stages from two to four lanes, with some realignments, on a 10.5-mile segment from the four-lane section completed in 1950 to just east of the junction with California State Route 156, with an interchange built at Casa de Fruta. In 2008, a T-junction and stop sign at the intersection with Route 156 on the remaining two-lane section of the highway west of Casa de Fruta was replaced with a flyover, greatly easing congestion there.

A segment of Route 152 west of Gilroy, between the Uvas Creek Bridge and Santa Teresa Blvd, was added to the National Register of Historic Places in 2007. This segment of the road, serving as a western gateway into Gilroy, is lined with deodar cedar trees that were planted on consecutive Arbor Days in 1930 and 1931.

Major intersections

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile	Exit	Destinations	Notes
Santa Cruz SCR T0.31-8.29	Watsonville	T0.31		SR 1 north – Santa Cruz	Interchange; westbound exit and eastbound entrance; west end of SR 152
		T2.50		Freedom Boulevard – Freedom
		T3.27 0.00		Lincoln Street
	​	R1.99		Holohan Road, College Road – Freedom, Santa Cruz
	​	3.69		Carlton Road, Casserly Road
Santa Clara SCL 0.00-R35.16	​	5.03		CR G8 (Watsonville Road) – Morgan Hill, San Jose
	Gilroy	7.93		Santa Teresa Boulevard	Serves Gavilan College
		M9.43		US 101 Bus. south (Monterey Street)	West end of US 101 Bus. overlap
		M9.78		US 101 Bus. north (Monterey Street) / Welburn Avenue	East end of US 101 Bus. overlap
		M10.28 R7.53		US 101 north / CR G9 (Leavesley Road) – San Jose	Interchange; west end of US 101 overlap
			West end of freeway on US 101
			East end of freeway on US 101
		R6.08 R9.91		US 101 south / 10th Street – Los Angeles	Interchange; east end of US 101 overlap
	​	12.81		CR G9 (Ferguson Road)
	​	14.89		CR G7 (Bloomfield Avenue)
	​	R21.98		SR 156 west – Hollister	Interchange; no westbound entrance
	​	R23.41		Casa de Fruta Parkway	Interchange
Merced MER R0.00-R40.95	​	11.27	60	SR 33 north to I-5 north – Santa Nella, Gustine	Interchange; west end of SR 33 overlap
	​	13.85		I-5 – Sacramento, San Francisco, Los Angeles	Interchange
	Los Banos	21.27		SR 165 (Mercey Springs Road) to I-5 south – Turlock
	​	R32.37		SR 33 south – Dos Palos, Mendota	Interchange; east end of SR 33 overlap
Merced–Madera county line	​	R40.77– R0.06		SR 59 – Merced	Interchange
Madera MAD R0.00-15.63	​	10.80		SR 233 (Robertson Boulevard) to SR 99 north – Chowchilla	Interchange
	Califa	15.63		SR 99 south – Madera, Fresno	Interchange; eastbound exit and westbound entrance; east end of SR 152; former US 99
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

External links

• Caltrans: Route 152 road conditions