Secret Ravine, California

Penryn (Washo: Pénwin) is a census-designated place in Placer County, California, in the United States. Geographic location is 38°51′08″N 121°10′06″W. Penryn is located 5.5 miles (8.9 km) northeast of Rocklin. The community's ZIP code is 95663 and is in area codes 916 and 279. The population was 831 at the 2010 census.

Newcastle is an unincorporated community and census-designated place (CDP) in Placer County, California. Nestled in the Sierra Nevada foothills, Newcastle is located 8 miles (12.9 km) northeast of Rocklin and 31 miles northeast of Sacramento. Newcastle generally has moderate winters and warm summers. The latitude of Newcastle is 38.874N, the longitude is -121.132W, and an elevation of 945 ft (288 m). The town's zip code is 95658 and is in area codes 916 and 279. The population of the CDP as of the 2010 U.S. Census is 1,224.

KKFS (103.9 MHz The Fish) is a commercial FM radio station licensed to Lincoln, California, and serving the Sacramento metropolitan area. The station carries a Christian contemporary radio format and is owned by the Salem Media Group, which also owns KFIA, KTKZ and KSAC-FM. Salem uses "The Fish" as its branding for Christian contemporary stations in Los Angeles, Atlanta, Nashville and Cleveland. KKFS has an effective radiated power (ERP) of 6,000 watts. The transmitter is on Cherry Hill Road near Interstate 80 in Newcastle.

Del Oro High School is located in Loomis, California, and is a part of the Placer Union High School District. Del Oro High School opened for the instruction of freshmen and sophomores on September 28, 1959, one week after Colfax opened. It was founded in 1958 and currently has over 1600 students attending. The dropout rate is 2%, which is below the California state average.

Hidden Valley (formerly, Union House) is a housing development in an unincorporated area of Placer County, California, adjacent to Granite Bay. Hidden Valley is located 4.25 miles (6.8 km) east-southeast of Rocklin. It lies at an elevation of 436 feet (133 m).Hidden Valley was established in 1950 and consists of semi-rural housing lots surrounding 180 acres of pasture and small lakes. It was originally planned as a retirement community, due to its rural setting, but it has since become a bedroom community for the Sacramento metropolitan area. It was once informally called the "Aerojet enclave" for the large number of executives of the aerospace company who resided in the area.

Loomis (formerly Pine, Pino, Smithville, and Placer) is an incorporated town in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area. The town's population was reported as 6,836 in the 2020 United States Census. It shares borders with the city of Rocklin and the Census-Designated Places Penryn and Granite Bay.

Ophir (also, Spanish Corral and Ophirville) is an unincorporated community in Placer County, California.Ophir is located 2.5 miles (4.0 km) west of Auburn. It lies at an elevation of 682 feet (208 m).Ophir addresses have the ZIP code of 95658, a Newcastle address.

Higgins Point is a former mining camp in El Dorado County, California. It was located a half mile west of the center of Salmon Falls. The place was named for the first person to open a store there, an Australian named Higgins. Rich diggings of gold were discovered by Mormons at Higgins Point in 1849. Higgins Point was the first part of Salmon Falls to be laid out as a town, starting in 1853.

The South Fork American River is a major tributary of the American River in El Dorado County, California, draining a watershed on the western slope of the Sierra Nevada east of Sacramento. The river begins in pristine Desolation Wilderness and flows through the Sierra Nevada foothills. The river at Coloma was the site of James Marshall's discovery of gold at Sutter's Mill on January 24, 1848, which started the California Gold Rush. The South Fork of the American is "the most popular recreation stream in the West" for whitewater rafting in North America, e.g., 80,000 visitors in 2011. Professional whitewater rafting companies have been offering commercial rafting trips on the South Fork American River since 1978.

The Folsom Lake State Recreation Area surrounds Folsom Lake in the foothills of the Sierra Nevada. The majority of it is owned by the U.S. Bureau of Reclamation and is managed by the California Department of Parks and Recreation. It is located near the city of Folsom, California, about 25 miles (40 km) east of Sacramento.

Auburn Fire House No. 2, also known as Auburn Hose Company No. 2, at the corner of Washington, Main, & Commercial Streets in Auburn, Placer County, California, was built in 1891. It was listed on the National Register of Historic Places in 2011.Architecture: Shingle Style

Auburn Dam was a proposed concrete arch dam on the North Fork of the American River east of the town of Auburn, California, in the United States, on the border of Placer and El Dorado Counties. Slated to be completed in the 1970s by the U.S. Bureau of Reclamation, it would have been the tallest concrete dam in California and one of the tallest in the United States, at a height of 680 feet (210 m) and storing 2,300,000 acre-feet (2.8 km3) of water. Straddling a gorge downstream of the confluence of the North and Middle Forks of the American River and upstream of Folsom Lake, it would have regulated water flow and provided flood control in the American River basin as part of Reclamation's immense Central Valley Project. The dam was first proposed in the 1950s; construction work commenced in 1968, involving the diversion of the North Fork American River through a tunnel and the construction of a massive earthen cofferdam. Following a nearby earthquake and the discovery of an unrelated seismic fault that underlay the dam site, work on the project was halted for fears that the dam's design would not allow it to survive a major quake on the same fault zone. Although the dam was redesigned and a new proposal submitted by 1980, spiraling costs and limited economic justification put an end to the project until severe flooding in 1986 briefly renewed interest in Auburn's flood control potential. The California State Water Resources Control Board denied water rights for the dam project in 2008 due to lack of construction progress. Although new proposals surfaced from time to time after the 1980s, the dam was never built for a number of reasons, including limited water storage capacity, geologic hazards, and potential harm to recreation and the local environment. Much of the original groundwork at the Auburn Dam site still exists, and up to 2007, the North Fork American River still flowed through the diversion tunnel that had been constructed in preparation for the dam. Reclamation and Placer County Water Agency completed a pump station project that year which blocked the tunnel, returned the river to its original channel, and diverted a small amount of water through another tunnel under Auburn to meet local needs. However, some groups continue to support construction of the dam, which they state would provide important water regulation and flood protection.