diff --git a/01_download_data.R b/01_download_data.R
index e69de29..2b8eb61 100644
--- a/01_download_data.R
+++ b/01_download_data.R
@@ -0,0 +1,30 @@
+# load libraries
+library(tidyverse)
+library(nhdplusTools)
+library(sf)
+
+# load extent of map
+extent <- read.csv(file = "extent.csv")
+crs <- 26916
+
+extent_poly <- st_polygon(
+  x = list(
+    cbind(
+      extent$longitude[c(1,2,2,1,1)], 
+      extent$latitude[c(1,1,2,2,1)])
+  )
+)
+
+extent_poly <- st_sfc(extent_poly, crs=4326)
+
+extent <- list(longitude_max = max(extent$longitude),
+               longitude_min = min(extent$longitude),
+               latitude_max = max(extent$latitude),
+               latitude_min = min(extent$latitude))
+
+
+# get watershed areas
+extent_huc <- get_huc(AOI = extent_poly, buffer = 0, type = "huc04")
+
+# download data
+download_nhdplushr("data", extent_huc$huc4, download_files = TRUE)
diff --git a/extent.csv b/extent.csv
new file mode 100644
index 0000000..2c3d01e
--- /dev/null
+++ b/extent.csv
@@ -0,0 +1,3 @@
+latitude,longitude
+43.63839,-89.97779
+42.52677,-88.52104