<Table> <Tr> <Th_colspan="2"> Lassen Volcanic National Park </Th> </Tr> <Tr> <Td_colspan="2"> IUCN category II (national park) </Td> </Tr> <Tr> <Td_colspan="2"> Lake Helen in Lassen Volcanic National Park </Td> </Tr> <Tr> <Td_colspan="2"> Show map of California Show map of the US Show all </Td> </Tr> <Tr> <Th> Location </Th> <Td> Shasta, Lassen, Plumas, and Tehama Counties, California, USA </Td> </Tr> <Tr> <Th> Nearest city </Th> <Td> Redding and Susanville </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 40 ° 29 ′ 16" N 121 ° 30 ′ 18" W ﻿ / ﻿ 40.4876594 ° N 121.5049807 ° W ﻿ / 40.4876594; - 121.5049807 Coordinates: 40 ° 29 ′ 16" N 121 ° 30 ′ 18" W ﻿ / ﻿ 40.4876594 ° N 121.5049807 ° W ﻿ / 40.4876594; - 121.5049807 </Td> </Tr> <Tr> <Th> Area </Th> <Td> 106,452 acres (430.80 km) </Td> </Tr> <Tr> <Th> Established </Th> <Td> August 9, 1916 </Td> </Tr> <Tr> <Th> Visitors </Th> <Td> 536,068 (in 2016) </Td> </Tr> <Tr> <Th> Governing body </Th> <Td> National Park Service </Td> </Tr> <Tr> <Th> Website </Th> <Td> Lassen Volcanic National Park </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Lassen Volcanic National Park </Th> </Tr>

When did lassen volcanic become a national park
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