diff --git a/.github/workflows/commit.yml b/.github/workflows/commit.yml
index 9264d2ac10..569e4ab2dd 100644
--- a/.github/workflows/commit.yml
+++ b/.github/workflows/commit.yml
@@ -302,7 +302,7 @@ jobs:
         uses: actions/cache@v2.1.0
         with:
           path: ~/conda_pkgs_dir
-          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.run-type }}-${{ hashFiles('etc/environment.yml', 'flopy') }}
+          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.run-type }}-${{ hashFiles('etc/environment.yml') }}
 
       # Standard python fails on windows without GDAL installation
       # Using custom bash shell ("shell: bash -l {0}") with Miniconda
diff --git a/.github/workflows/daily.yml b/.github/workflows/daily.yml
index 7015e65f18..eb624e4a83 100644
--- a/.github/workflows/daily.yml
+++ b/.github/workflows/daily.yml
@@ -291,7 +291,7 @@ jobs:
         uses: actions/cache@v2.1.0
         with:
           path: ~/conda_pkgs_dir
-          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.run-type }}-${{ hashFiles('etc/environment.yml', 'flopy') }}
+          key: ${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.run-type }}-${{ hashFiles('etc/environment.yml') }}
 
       # Standard python fails on windows without GDAL installation
       # Using custom bash shell ("shell: bash -l {0}") with Miniconda
diff --git a/flopy/discretization/grid.py b/flopy/discretization/grid.py
index 80d259e468..de66e32b06 100644
--- a/flopy/discretization/grid.py
+++ b/flopy/discretization/grid.py
@@ -680,6 +680,11 @@ def _warn_intersect(self, module, lineno):
 
         Should be be removed after a couple of releases. Added in 3.3.5
 
+        Updated in 3.3.6 to raise an error and exit if intersect interface
+        is called incorrectly.
+
+        Should be removed in flopy 3.3.7
+
         Parameters
         ----------
         module : str
@@ -698,7 +703,8 @@ def _warn_intersect(self, module, lineno):
             "intersect(self, x, y, z=None, local=False, "
             "forgive=False) interface instead."
         )
-        warnings.warn_explicit(warning, UserWarning, module, lineno)
+
+        raise UserWarning(warning)
 
     def set_coord_info(
         self,
diff --git a/flopy/discretization/structuredgrid.py b/flopy/discretization/structuredgrid.py
index e923b7d521..ba42de2ee5 100644
--- a/flopy/discretization/structuredgrid.py
+++ b/flopy/discretization/structuredgrid.py
@@ -773,9 +773,10 @@ def intersect(self, x, y, z=None, local=False, forgive=False):
             The column number
 
         """
-        # trigger interface change warning
-        frame_info = inspect.getframeinfo(inspect.currentframe())
-        self._warn_intersect(frame_info.filename, frame_info.lineno)
+        if isinstance(z, bool):
+            # trigger interface change warning
+            frame_info = inspect.getframeinfo(inspect.currentframe())
+            self._warn_intersect(frame_info.filename, frame_info.lineno)
 
         # transform x and y to local coordinates
         x, y = super().intersect(x, y, local, forgive)
diff --git a/flopy/discretization/unstructuredgrid.py b/flopy/discretization/unstructuredgrid.py
index 902cf3995f..329718f2c3 100644
--- a/flopy/discretization/unstructuredgrid.py
+++ b/flopy/discretization/unstructuredgrid.py
@@ -538,8 +538,9 @@ def intersect(self, x, y, z=None, local=False, forgive=False):
             The CELL2D number
 
         """
-        frame_info = inspect.getframeinfo(inspect.currentframe())
-        self._warn_intersect(frame_info.filename, frame_info.lineno)
+        if isinstance(z, bool):
+            frame_info = inspect.getframeinfo(inspect.currentframe())
+            self._warn_intersect(frame_info.filename, frame_info.lineno)
 
         if local:
             # transform x and y to real-world coordinates
diff --git a/flopy/discretization/vertexgrid.py b/flopy/discretization/vertexgrid.py
index 251a14db1b..9ee51a0caa 100644
--- a/flopy/discretization/vertexgrid.py
+++ b/flopy/discretization/vertexgrid.py
@@ -283,8 +283,9 @@ def intersect(self, x, y, z=None, local=False, forgive=False):
             The CELL2D number
 
         """
-        frame_info = inspect.getframeinfo(inspect.currentframe())
-        self._warn_intersect(frame_info.filename, frame_info.lineno)
+        if isinstance(z, bool):
+            frame_info = inspect.getframeinfo(inspect.currentframe())
+            self._warn_intersect(frame_info.filename, frame_info.lineno)
 
         if local:
             # transform x and y to real-world coordinates