Loch Lomond is a reservoir in the Santa Cruz Mountains near Lompico in Santa Cruz County, California. Part of the Santa Cruz Water Department system, it was created by building the Newell Creek Dam across Newell Creek – a tributary of the San Lorenzo River. The dam is an earth-fill barricade, measuring 190 ft (58 m) by 750 ft (230 m). It was financed by bond issuance, and completed in the Fall of 1960; impounded water first ran over the spillway in March 1963.

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Loch Lomond
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Location	Santa Cruz Mountains Santa Cruz County, California
Coordinates	37°06′11″N 122°04′24″W
Type	Reservoir
Primary inflows	Newell Creek
Primary outflows	Newell Creek
Basin countries	United States
Max. length	3 mi (4.8 km)
Max. width	0.25 mi (0.40 km)
Surface area	175 acres (71 ha)
Max. depth	150 ft (46 m)
Water volume	9,200 acre⋅ft (11,300,000 m3)
Surface elevation	574 ft (175 m)
References	U.S. Geological Survey Geographic Names Information System: Loch Lomond

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The reservoir is 175 acres (71 ha). It is 2.5 mi (4.0 km) long, 0.25 mi (0.40 km) wide, approximately 150 ft (46 m) deep, with a 9,200 acre⋅ft (11,300,000 m³) capacity. It provides a main portion of the drinking water supply for the city of Santa Cruz, California^[1] and also supplies other nearby county areas. Boating, fishing, picnicking and hiking take place at the reservoir. No daily private boat launching is permitted. No swimming is allowed. The reservoir has a boat rental and snack shop and is open every day from March 1 to September 15, and weekends only from Labor Day to October 17.

Surrounding the reservoir is the Loch Lomond Recreation Area, which is owned and operated by the City of Santa Cruz Water Department.^[2] It has hiking trails, picnic areas, and boating access.

• List of lakes of California