diff --git a/autotest/test_usg_transport.py b/autotest/test_usg_transport.py
index 2de8f6a0b..f4a3d33e6 100644
--- a/autotest/test_usg_transport.py
+++ b/autotest/test_usg_transport.py
@@ -735,3 +735,36 @@ def test_usg_load_Ex9_PFAS(function_tmpdir, mfusg_transport_Ex9_PFAS_model_path)
     success, buff = m.run_model()
     msg = "flopy failed on running PFAS_C1.nam"
     assert success, msg
+
+
+def test_mfusgrch_selev_iznrch(function_tmpdir):
+    """Repro #2763"""
+    from flopy.modflow import ModflowDis
+
+    m = MfUsg(
+        version="mfusg",
+        structured=True,
+        model_ws=function_tmpdir,
+        modelname="test_rch",
+    )
+    ModflowDis(m, nlay=1, nrow=3, ncol=3, nper=2)
+
+    rech = 1e-3
+    selev_data = np.full((3, 3), 5.0, dtype=np.float32)
+    iznrch_data = np.full((3, 3), 2, dtype=np.int32)
+
+    rch = MfUsgRch(
+        m,
+        nrchop=3,
+        rech=rech,
+        seepelev=1,
+        selev=selev_data,
+        iznrch=iznrch_data,
+    )
+
+    assert np.allclose(rch.selev[0].array, selev_data)
+    assert np.array_equal(rch.iznrch[0].array, iznrch_data)
+
+    rch.write_file(check=False)
+    content = (function_tmpdir / "test_rch.rch").read_text()
+    assert " # Stress period 1" in content
diff --git a/flopy/mfusg/mfusgoc.py b/flopy/mfusg/mfusgoc.py
index 8b60b6bd0..010770b77 100644
--- a/flopy/mfusg/mfusgoc.py
+++ b/flopy/mfusg/mfusgoc.py
@@ -955,11 +955,11 @@ def load(cls, f, model, nper=None, nstp=None, nlay=None, ext_unit_dict=None):
                     if kwargs["atsa"]:
                         line = f.readline()
                         lnlst = line.strip().split()
-                        lines.append("DELTAT {float(lnlst[0]):11.4e}")
-                        lines.append("TMINAT {float(lnlst[1]):11.4e}")
-                        lines.append("TMAXAT {float(lnlst[2]):11.4e}")
-                        lines.append("TADJAT {float(lnlst[3]):11.4e}")
-                        lines.append("TCUTAT {float(lnlst[4]):11.4e}")
+                        lines.append(f"DELTAT {float(lnlst[0]):11.4e}")
+                        lines.append(f"TMINAT {float(lnlst[1]):11.4e}")
+                        lines.append(f"TMAXAT {float(lnlst[2]):11.4e}")
+                        lines.append(f"TADJAT {float(lnlst[3]):11.4e}")
+                        lines.append(f"TCUTAT {float(lnlst[4]):11.4e}")
 
                     line = f.readline()
                     lnlst = line.strip().split()
diff --git a/flopy/mfusg/mfusgrch.py b/flopy/mfusg/mfusgrch.py
index eb9713ab9..83f45245f 100644
--- a/flopy/mfusg/mfusgrch.py
+++ b/flopy/mfusg/mfusgrch.py
@@ -118,14 +118,14 @@ def __init__(
         if selev is not None:
             selev_u2d_shape = get_pak_vals_shape(model, selev)
             self.selev = Transient2d(
-                model, selev_u2d_shape, np.float32, rech, name="rech_selev"
+                model, selev_u2d_shape, np.float32, selev, name="rech_selev"
             )
 
         self.iznrch = None
         if iznrch is not None:
             iznrch_u2d_shape = get_pak_vals_shape(model, iznrch)
             self.iznrch = Transient2d(
-                model, iznrch_u2d_shape, np.int32, rech, name="rech_izn"
+                model, iznrch_u2d_shape, np.int32, iznrch, name="rech_izn"
             )
 
         self.rchconc = None
@@ -173,7 +173,7 @@ def write_file(self, check=True, f=None):
         if self.iconc:
             f_rch.write(" CONC")
         if self.mxrtzones:
-            f_rch.write(f" RTS {self.mxrtzones:4.0d}")
+            f_rch.write(f" RTS {self.mxrtzones:4d}")
         f_rch.write("\n")
 
         mcomp = self.parent.mcomp
@@ -219,7 +219,7 @@ def write_file(self, check=True, f=None):
                 f_rch.write(" INSELEV 1")
             if self.rchconc is not None:
                 f_rch.write(" INCONC 1")
-            f_rch.write("# Stress period {kper + 1}\n")
+            f_rch.write(f" # Stress period {kper + 1}\n")
 
             if inrech >= 0:
                 f_rch.write(file_entry_rech)