diff --git a/modflowapi/extensions/apimodel.py b/modflowapi/extensions/apimodel.py
index 16086ec..d899d7d 100644
--- a/modflowapi/extensions/apimodel.py
+++ b/modflowapi/extensions/apimodel.py
@@ -161,6 +161,7 @@ def __init__(self, mf6, name):
             "ic": ArrayPackage,
             "npf": ArrayPackage,
             "rch": ListPackage,
+            "riv": ListPackage,
             "sto": ArrayPackage,
             "wel": ListPackage,
             # gwt
diff --git a/modflowapi/extensions/pakbase.py b/modflowapi/extensions/pakbase.py
index fcc6fe8..19be40c 100644
--- a/modflowapi/extensions/pakbase.py
+++ b/modflowapi/extensions/pakbase.py
@@ -72,6 +72,15 @@
         "auxname_cst",
         "auxvar",
     ],
+    "riv": [
+        "maxbound",
+        "nbound",
+        "nodelist",
+        ("bound", ("stage", "cond", "rbot")),
+        "naux",
+        "auxname_cst",
+        "auxvar",
+    ],
     "sto": ["iconvert", "ss", "sy"],
     "wel": [
         "maxbound",