diff --git a/DESCRIPTION b/DESCRIPTION
index b8357633..b564dfcd 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -28,7 +28,7 @@ URL: https://doi-usgs.github.io/nhdplusTools/ https://github.com/doi-usgs/nhdplu
 BugReports: https://github.com/doi-usgs/nhdplusTools/issues/
 Depends:
     R (>= 4.0)
-Imports: hydroloom, dataRetrieval, dplyr, sf, units, magrittr, jsonlite, httr, xml2, R.utils, utils, tidyr, methods, maptiles, mapsf, fst, arrow, tools, zip, pbapply, memoise
+Imports: hydroloom, dataRetrieval, dplyr, sf, units, magrittr, jsonlite, httr, xml2, R.utils, utils, tidyr, methods, maptiles, mapsf, fst, arrow, tools, zip, pbapply, memoise, digest
 Suggests: testthat, knitr, rmarkdown, ggmap, ggplot2, lwgeom, gifski, leaflet, httptest, future, future.apply
 License: CC0
 Encoding: UTF-8
diff --git a/NAMESPACE b/NAMESPACE
index 94217dc9..554b8292 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -77,6 +77,7 @@ export(subset_rpu)
 export(subset_vpu)
 importFrom(arrow,open_dataset)
 importFrom(arrow,s3_bucket)
+importFrom(digest,digest)
 importFrom(dplyr,across)
 importFrom(dplyr,all_of)
 importFrom(dplyr,any_of)
@@ -131,6 +132,9 @@ importFrom(hydroloom,sort_network)
 importFrom(hydroloom,st_compatibalize)
 importFrom(jsonlite,fromJSON)
 importFrom(magrittr,`%>%`)
+importFrom(memoise,cache_filesystem)
+importFrom(memoise,cache_memory)
+importFrom(memoise,memoise)
 importFrom(methods,as)
 importFrom(methods,is)
 importFrom(pbapply,pbapply)
diff --git a/R/A_nhdplusTools.R b/R/A_nhdplusTools.R
index b038624c..a4fa1cc2 100644
--- a/R/A_nhdplusTools.R
+++ b/R/A_nhdplusTools.R
@@ -382,6 +382,8 @@ nhdplusTools_cache_settings <- function(mode = NULL, timeout = NULL) {
   return(invisible(list(mode = current_mode, timeout = current_timeout)))
 }
 
+#' @importFrom memoise memoise cache_memory cache_filesystem
+#' @importFrom digest digest
 nhdplusTools_memoise_cache <- function() {
   sys_memo_cache <- Sys.getenv("NHDPLUSTOOLS_MEMOISE_CACHE")
   ses_memo_cache <- try(get("nhdpt_mem_cache", envir = nhdplusTools_env), silent = TRUE)