question: On what lake does the community at the beginning of Interstate 15 sit?
answer: Ivanpah Dry Lake
context: Title: List of suffixed Interstate Highways
  Passage: Currently the Interstate Highway System includes seven suffixed routes that are signed: the Interstate 35 split into Interstate 35E and Interstate 35W at Dallas-Fort Worth, Texas; a similar split into Interstate 35E and Interstate 35W at Minneapolis-St.  Paul, Minnesota; as well as Interstate 69C, Interstate 69E and Interstate 69W in South Texas; in addition, Interstate 480N in Ohio exists and is designated as such on mile markers but is otherwise unsigned.  However, there were once many more, as the three-digit Interstates were not designated until after all major routes were assigned numbers, including some short connections and spurs.  (A few of the shortest, including I-190 and I-195, were assigned three-digit numbers almost immediately.)  Most were not equal splits like on I-35, but had the main route continue through, and often the suffixed route never returned to its parent.  In 1980, AASHTO abolished the majority of suffixes due to confusion, renumbering them as three-digit Interstates, but several that return to their parents were kept.  For example, Interstate 15E has since become Interstate 215, but both I-35E/I-35W and I-69 splits still exist.
  Title: Interstate 15 in Montana
  Passage: In the U.S. state of Montana, Interstate 15 continues onward from Idaho for nearly 400 mi through the cities of Butte, Helena and Great Falls, intersecting with Interstate 90, Interstate 115 and Interstate 315.  Interstate 15 reaches its northern terminus at the international border with Alberta, Canada.
  Title: Interstate 15 in Nevada
  Passage: Interstate 15 (I-15) is an Interstate Highway in the U.S. state of Nevada that begins in Primm, continues through Las Vegas and it crosses the border with Arizona in Mesquite.  The freeway runs entirely in Clark County.  Many motorists use I-15 to visit Las Vegas, as it is the only primary Interstate Highway in the city.  The highway was built along the corridor of the older U.S. Route 91 (US 91) and Arrowhead Trail, eventually replacing both of these designations.
  Title: Interstate 15
  Passage: Interstate 15 (I-15) is a major Interstate Highway in the western United States.  I-15 begins near the Mexico–US border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana.  The interstate serves the cities of San Diego, Las Vegas, St. George, Salt Lake City, Pocatello, Idaho Falls, and Butte.  It also passes close to the urban areas of Orange County, California, Los Angeles County, California, Provo, Utah, Ogden, Utah, and Helena, Montana.  The stretches of Interstate 15 in Idaho, Utah, and Arizona have been designated as the "Veterans Memorial Highway".
  Title: Primm, Nevada
  Passage: Primm (formerly known as State Line and often called Primm Valley) is an unincorporated community in Clark County, Nevada, United States, primarily notable for its position straddling Interstate 15 where it crosses the state border between California and Nevada.  It sits on Ivanpah Dry Lake, which extends to the north and south of town.
  Title: Alberta Highway 4
  Passage: Alberta Provincial Highway No. 4, commonly referred to as Highway 4, is a 103 km highway in southern Alberta, Canada that connects Highway 3 in Lethbridge to Interstate 15 in Montana, and is the southernmost portion of Alberta's Export Highway.  It begins at Alberta's busiest border crossing in Coutts, winding north through gentle rolling hills and farmlands in the south of the province.  It bypasses Milk River, Warner and Stirling before reaching Lethbridge where it becomes 43 Street and ends at Crowsnest Trail on the east side of the city.  In 1995, it was designated as part of the CANAMEX Corridor that links Canada to Mexico and the United States, including the major cities of Salt Lake City, Las Vegas, Los Angeles, and San Diego which lie on Interstate 15.  In 1999, the highway was renamed the First Special Service Force Memorial Highway in honour of elite soldiers who travelled to Helena, Montana for training in preparation for World War II.  Between Lethbridge and Highway 61 near Stirling, Highway 4 is signed as part of the Red Coat Trail, a historic route stretching from southern Alberta into Manitoba that is advertised as that which was travelled by the North-West Mounted Police.
  Title: Sloan, Nevada
  Passage: Sloan is an unincorporated community with a population of 105 (as of the U.S. Census 2010) in Clark County, Nevada, situated 18 miles southwest of Las Vegas.  It is named for its limestone dolomite carnotite and was first settled in 1912 under the name Ehret, NV; named for the founders family name, but changed its name to Sloan on September 11, 1922.  It is known for its canyon and its Sloan Canyon Petroglyph Site, Petroglyph Canyon, Black Mountain, and is mostly located within the North McCullough Wilderness Area and is adjacent to the McCullough Range.  It contains well-preserved petroglyphs and several hiking trails that allow visitors to photograph the petroglyphs.  Sloan is also home to the George W. Dunaway Army Reserve Center which officially opened in April 2015, which is a large military area not open for public.  2.7 miles west of Sloan was the site of the Bonanza Air Lines Flight 114 accident, which killed 29 people.  Most of the residential areas are located on the main street, Sloan Road, and other smaller roads such as Arville Street, Hinston Street, and Roark Avenue.  It is adjacent to the Interstate 15 in Nevada.  To get here from Las Vegas, take Interstate 15 south and take exit 25 at Sloan.  On Las Vegas Boulevard, turn right for the residential areas and George W. Dunaway Army Reserve Center, while turn left and follow Las Vegas Boulevard for 0.1 mile to reach the road leading to Sloan Canyon National Conservation Area.  Following the power line road is treacherous.  A faster, safer, and brand new paved road through the Henderson neighborhood of Anthem takes you to the Sloan Canyon visitors center and trailhead to the Petroglyphs.
  Title: Interstate 115
  Passage: Interstate 115 (I-115) is a very short auxiliary Interstate Highway which connects Interstate 15/90 to Butte in the U.S. state of Montana.  The highway is 1.19 mi long and is overlapped by Business Interstate 15/90 for its entire length.  The route travels from an incomplete interchange with I-15/90 through generally rural areas in western Butte.  It interchanges with Excelsior Avenue before terminating.  The entire route was improved to interstate standards during the 1960s, and was improved in 2005.
citations: Interstate 15 in Nevada Primm, Nevada