Download and cache NHD data by state
nhd_get(state = NA, force_dl = FALSE, force_unzip = FALSE, temporary = TRUE)
An invisible list of file paths to NHD data for the specified state
character state abbreviation includes "DC", "PR", and "VI"
logical force a re-download of the requested data
logical force an unzip of downloaded data
logical set FALSE to save data to a persistent rappdirs location
if (FALSE) { nhd_get(state = c("DC")) nhd_get(state = c("RI", "CT")) }
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