Lake County, Colorado

Lake Fork is a tributary of the Arkansas River in Lake County, Colorado. The river rises in the Holy Cross Wilderness north of Mount Massive in the Northern Sawatch Range of Colorado. It flows through Timberline Lake and then through Turquoise Lake west of Leadville. The river then flows south and joins the Arkansas River southwest of Leadville and west of U.S. Highway 24.

This is a list of the National Register of Historic Places listings in Lake County, Colorado. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Lake County, Colorado, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map. There are 10 properties and districts listed on the National Register in the county.     This National Park Service list is complete through NPS recent listings posted January 19, 2024.

Carbonate County was a county of the state of Colorado that existed for only two days in 1879. Carbonate County was created by renaming Lake County, Colorado.

The California Gulch site consists of approximately 18 square miles in Lake County, Colorado. The area includes the city of Leadville, parts of the Leadville Historic Mining District and a section of the Arkansas River from the confluence of California Gulch downstream to the confluence of Two-Bit Gulch. The site was listed as a Superfund site in 1983.

Leadville National Fish Hatchery established in 1889 west of Leadville, Colorado is one of 70 hatcheries in the National Fish Hatchery System. It is managed by the United States Fish and Wildlife Service. It lies within the Mount Massive Wilderness, most of whose area lies within San Isabel National Forest and which is managed by the United States Forest Service. Leadville National Fish Hatchery was listed on the National Register of Historic Places in 1980.

The High Mountain Institute (HMI) is a non-profit educational organization located in Leadville, Colorado. Founded in 1995 by Molly and Christopher Barnes, HMI focuses on educating teenagers through interaction with the natural world of the American West and Patagonia, South America. The school offers semester and summer programs for high school students, gap year programming for high school graduates, and short programs for middle school students and adults.

Lake County Airport (IATA: LXV, ICAO: KLXV, FAA LID: LXV), also known as Leadville Airport, is a county-owned public-use airport located two nautical miles (3.7 km) southwest of the central business district of Leadville, a city in Lake County, Colorado, United States. According to the FAA's National Plan of Integrated Airport Systems for 2009–2013, it is categorized as a general aviation airport.At an elevation of 9,934 ft (3,026 m) above mean sea level the airport claims the distinction of being North America's highest. Pilots receive a free certificate commemorating their landing upon a successful landing. Aircraft performance deteriorates rapidly with altitude, so many organizations use the Leadville Airport as a base for high-altitude performance testing.

Sugar Loaf Dam is a dam in Lake County of mid-Colorado, 4 miles (6.4 km) west of Leadville. It has a height of 135 feet (41 m) feet and is over 2,000 feet (610 m) long at its crest, impounding the Lake Fork of the Arkansas River near its headwaters. The earthen dam was one of five reservoir dams completed from 1965 to 1968 by the United States Bureau of Reclamation as part of the larger water diversion project named the Fryingpan-Arkansas Project. The project was authorized in 1962 by President Kennedy and was completed in 1981. The Fry-Ark diverts water across the continental divide from the Colorado River basin. This water is delivered to the more arid plains east of the Rocky Mountains. Although the predominant use is agricultural, some water is available to several cities east of the continental divide, including: Colorado Springs, Pueblo, La Junta, Lamar. Water is diverted from the West Slope's Fryingpan River basin through a series of interconnected tunnels and small diversion dams into the Charles H. Boustead Tunnel. The Boustead runs water underneath the Continental Divide 5.5 miles (8.9 km) before discharging it into Turquoise Lake. Water then leaves Turquoise Lake via the Mt. Elbert Conduit, which runs nearly 11 miles (18 km) to the Mt. Elbert Forebay, then dropped down over 0.5 miles (0.80 km) in elevation to the hydro-electric Mt. Elbert Power Plant.Turquoise Lake is the reservoir created by the dam. It has a surface area of 1,780 acres (720 ha) and a capacity of 129,440 acre-feet (159,660,000 cubic meters). The lake and its surrounding land provide various recreational activities for visitors in both the summer and winter.

Derry Mining Site Camp was a mining site camp near Leadville, Colorado that operated during 1916–1923. It was listed on the National Register of Historic Places in 2000. The listing included eight contributing buildings and one contributing site.It is located on the old Twin Lakes Toll Road, at an elevation of 9,320 feet (2,840 m). It is close to the Hayden Ranch Headquarters, which is also National Register-listed.

East Fork Arkansas River is a 20.6-mile-long (33.2 km) tributary of the Arkansas River that flows from a source on Mount Arkansas in the Mosquito Range of central Colorado. It joins with Tennessee Creek to form the Arkansas River west of Leadville, Colorado.

Tennessee Creek is a stream in Lake County, Colorado. It rises on the south side of Tennessee Pass near the Eagle County-Lake County line. The creek joins with the East Fork Arkansas River northwest of Leadville to form the Arkansas River. At the confluence of Tennessee Creek and East Fork Arkansas River, the river that bears only the name "Arkansas River" begins.

Hayden Ranch Headquarters is located near Leadville, Colorado and is an example of early high country agricultural operations. Colorado Mountain College currently owns the property. A 35 acres (14 ha) portion of the original ranch was listed on the National Register of Historic Places in 2003. The listing included 16 contributing buildings and a contributing site. The ranch is at elevation of 9,180 feet (2,800 m). It is located about ten miles south of Leadville and eighteen miles north of Granite, Colorado on U.S. Highway 24, which is also known as the Top of the Rockies State and National Historic and Scenic Byway. It is close to the Derry Mining Site Camp, which is also National Register-listed.