Lava Hot Springs is a city along the Portneuf River in eastern Bannock County, Idaho, United States. It is part of the Pocatello, Idaho metropolitan area. The population was 407 at the 2010 census, down from 521 in 2000. Located in the mountainous valley of the Portneuf River on the old route of the Oregon Trail and California Trail, the city has become a popular resort location, noted for its numerous hot springs amenable to bathing and a turbulent inner tube run through part of the town. Geography Lava Hot Springs is located at (42.619482, -112.014283), at an elevation of above sea level. According to the United States Census Bureau, the city has a total area of , of which, is land and is water. Demographics 2010 census At the 2010 census there were 407 people in 209 households, including 104 families, in the city. The population density was . There were 317 housing units at an average density of . The racial makeup of the city was 97.5% White, 0.2% African American, 0.2% Native American, 1.2% from other races, and 0.7% from two or more races. Hispanic or Latino of any race were 4.2%. Of the 209 households 16.3% had children under the age of 18 living with them, 40.2% were married couples living together, 8.1% had a female householder with no husband present, 1.4% had a male householder with no wife present, and 50.2% were non-families. 44.5% of households were one person and 20.6% were one person aged 65 or older. The average household size was 1.95 and the average family size was 2.74. The median age was 50.9 years. 16.7% of residents were under the age of 18; 6.2% were between the ages of 18 and 24; 19.2% were from 25 to 44; 31.4% were from 45 to 64; and 26.5% were 65 or older. The gender makeup of the city was 48.2% male and 51.8% female. 2000 census At the 2000 census there were 521 people in 232 households, including 125 families, in the city. The population density was . There were 309 housing units at an average density of . The racial makeup of the city was 96.93% White, 1.15% Native American, 0.19% Asian, 1.34% from other races, and 0.38% from two or more races. Hispanic or Latino of any race were 2.30%. Of the 232 households 24.1% had children under the age of 18