Question: Bridge Mountain and Red Rock Canyon National Conservation Area are both managed by who?

Context paragraphs:
Sandstone Ranch (Nevada): Sandstone Ranch or Sand Stone Ranch, as it was first known, was listed on the United States National Register of Historic Places on April 2, 1976.  The ranch is within the boundaries of the Spring Mountain Ranch State Park and Red Rock Canyon National Conservation Area and sits below the Wilson Range.

Bridge Mountain: Bridge Mountain is a mountain located in the Spring Mountain range of southern Nevada.  It is located on land managed by the United States Bureau of Land Management as the Red Rock Canyon National Conservation Area, part of the Rainbow Mountain Wilderness.  Bridge Mountain is named for the natural feature of a bridge-like natural arch of sandstone near the summit.

Mount Wilson (Nevada): Mount Wilson is a mountain located in the Spring Mountain range of southern Nevada.  It is located on land managed by the United States Bureau of Land Management as the Red Rock Canyon National Conservation Area, part of the Rainbow Mountain Wilderness Area.  It is the highest peak in the Red Rock Canyon National Conservation Area.

Spring Mountains: The Spring Mountains are a mountain range of southern Nevada in the United States, running generally northwest-southeast along the west side of Las Vegas and south to the border with California.  Most land in the mountains is owned by the United States Forest Service and the Bureau of Land Management and managed as the Spring Mountains National Recreation Area within the Humboldt-Toiyabe National Forest and the Red Rock Canyon National Conservation Area.

Gunnison Gorge National Conservation Area: The Gunnison Gorge National Conservation Area is a 62844 acres National Conservation Area located in west-central Colorado near Montrose.  It is managed by the Bureau of Land Management (BLM) as part of the National Landscape Conservation System.  57725 acres were designated in the Black Canyon of the Gunnison National Park and Gunnison Gorge National Conservation Area Act of 1999 (Public Law 106-76).  The Black Canyon of the Gunnison Boundary Revision Act of 2003 (PL 108-78) expanded the NCA to its current size.

Spring Mountain Ranch State Park: Spring Mountain Ranch State Park is a public recreation area preserving the historic Sandstone Ranch 5 mi northwest of Blue Diamond, Nevada.  The state park is located within the Red Rock Canyon National Conservation Area in Nevada's Cottonwood Valley.

Red Rock Canyon National Conservation Area: The Red Rock Canyon National Conservation Area in Nevada is an area managed by the Bureau of Land Management as part of its National Landscape Conservation System, and protected as a National Conservation Area.  It is located about 15 mi west of Las Vegas, and is easily seen from the Las Vegas Strip.  The area is visited by more than two million people each year.

Summerlin South, Nevada: Summerlin South, also seen on maps as South Summerlin, is an affluent census-designated place (CDP) in Clark County, Nevada, United States, on the western edge of the Las Vegas Valley and adjacent to the Red Rock Canyon National Conservation Area.  It is so named because it is a southward extension of the master-planned community of Summerlin.  Nearly all of Summerlin South is in ZIP code 89135.  The population was 24,085 at the 2010 Census.

The Lakes, Las Vegas: The Lakes is an affluent 2 sqmi planned community located within the city limits of Las Vegas, Nevada.  It is located in the western part of the Las Vegas Valley near the Spring Mountains and Red Rock Canyon National Conservation Area.  The centerpiece of the community, and its namesake, is a large man-made lake, Lake Sahara.  It was originally planned to have two man-made lakes but was downscoped to one.  It was built from the mid-1980s to the mid-1990s, and at the time was at the edge of development in the valley.  It consists of a mixture of gated communities consisting of large single-family homes, condominia, commercial areas and offices.

Spring Mountains National Recreation Area: The Spring Mountains National Recreation Area (SMNRA) is a U.S. National Recreation Area, administered by the U.S. Forest Service, and lies west of Las Vegas, Nevada.  It covers over 316,000 acres (1,279 km) of land.  The area runs from low meadows at around 3,000 feet (900 m) of elevation to Mount Charleston at 11,918 feet (3633 m) in elevation.  The SMNRA is a part of the Humboldt-Toiyabe National Forest.  It adjoins the Red Rock Canyon National Conservation Area, which is administered by the Bureau of Land Management.

Supporting paragraphs: Bridge Mountain Red Rock Canyon National Conservation Area
Answer: Bureau of Land Management