diff --git a/bin_mounted/ngen_rte/configs.py b/bin_mounted/ngen_rte/configs.py
index 3db8060..246544c 100644
--- a/bin_mounted/ngen_rte/configs.py
+++ b/bin_mounted/ngen_rte/configs.py
@@ -16,6 +16,7 @@
     InputConfig,
     ModulePropertiesConfig,
     NWMOutputConfig,
+    DataAssimilationConfig,
     ParallelConfig,
 )
 from mswm.utils.settings import DEFAULT_DATETIME_FORMAT as DDF
@@ -83,6 +84,8 @@ class RTEBaseConfig(BaseModelStrict):
         Output format(s) for output variables. Accepts 'CSV', 'NetCDF', or both. Defaults to ["CSV"] in MSWM.
     hydrofab_file: str | None = Field(default=None)
         Optional hydrofabric file path. If provided, bypasses MSWM Icefabric server API call.
+    reservoir_rfc_dir: str | None = Field(default=None)
+        Optional path to reservoir RFC forecast time-series directory. If provided, reservoir_da is set to True and passed to DataAssimilationConfig
     fcst_run_name: str | None = Field(default=None)
         Forecast run name.
     cycle_datetime: datetime | None = Field(default=None)
@@ -117,6 +120,7 @@ class RTEBaseConfig(BaseModelStrict):
     nwm_output_vars: bool = Field(default=False)
     output_format: list[str] | None = Field(default=None)
     hydrofab_file: str | None = Field(default=None)
+    reservoir_rfc_dir: str | None = Field(default=None)
     fcst_run_name: str | None = Field(default=None)
     cycle_datetime: datetime | None = Field(default=None)
     lookback: int | None = Field(default=None)
@@ -500,6 +504,15 @@ def mswm_DataFileConfig(self) -> DataFileConfig:
             )
         )
         return dfc
+    
+    @property
+    def mswm_DataAssimilationConfig(self) -> DataAssimilationConfig:
+        """MSWM DataAssimilationConfig instance"""
+        dac = DataAssimilationConfig(
+            reservoir_da=bool(self.reservoir_rfc_dir),
+            reservoir_rfc_dir=self.reservoir_rfc_dir,
+        )
+        return dac
 
     @property
     def mswm_ParallelConfig(self) -> ParallelConfig:
@@ -517,6 +530,7 @@ def mswm_InputConfig(self) -> InputConfig:
         calibration = self.mswm_CalibConfig
         forcing = self.mswm_ForcingConfig
         data_file = self.mswm_DataFileConfig
+        data_assimilation = self.mswm_DataAssimilationConfig
         parallel = self.mswm_ParallelConfig
         ic = InputConfig(
             General=general,
@@ -526,6 +540,7 @@ def mswm_InputConfig(self) -> InputConfig:
             Calibration=calibration,
             Forcing=forcing,
             DataFile=data_file,
+            DataAssimilation=data_assimilation,
             Parallel=parallel,
         )
         return ic
diff --git a/bin_mounted/ngen_rte/run_config/cli_args.py b/bin_mounted/ngen_rte/run_config/cli_args.py
index e7ac1c2..56f3292 100644
--- a/bin_mounted/ngen_rte/run_config/cli_args.py
+++ b/bin_mounted/ngen_rte/run_config/cli_args.py
@@ -530,3 +530,18 @@ def add_arg(parser: argparse.ArgumentParser, arg: ArgsKwargs) -> None:
         Script.REGIONALIZATION,
     ],
 )
+
+RESERVOIR_RFC_DIR = ArgsKwargs(
+    args=["-rfc", "--reservoir_rfc_dir"],
+    kwargs={
+        "type": str,
+        "default": None,
+        "help": "Path to reservoir RFC forecast time-series directory. If provided,"
+        "reservoir data assimilation is enabled and reservoir_da is set to True.",
+    },
+    scripts=[
+        Script.FORECAST,
+        Script.DEFAULT,
+        Script.REGIONALIZATION,
+    ],
+)
diff --git a/run_default.sh b/run_default.sh
index 9169c2f..7e656d7 100755
--- a/run_default.sh
+++ b/run_default.sh
@@ -53,6 +53,10 @@ docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "medium_range_blend"
 # docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "aorc" -dt "2013-07-25 00:00:00" -dur 2 -rname "default_aorc" -mf "snow-17,noah-owp-modular,smp,lasam,t-route" -rz "true"
 # docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "aorc" -dt "2013-07-25 00:00:00" -dur 2 -rname "default_aorc" --output_format CSV NetCDF
 
+# Reservoir RFC Data Assimilation (RFC reservoir test data only valid at "2026-07-13 12:00:00")
+# docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "short_range" -dt "2026-07-13 12:00:00" -rname "default_sr" -g "01205500" -rfc /ngwpc/run_ngen/data/rfc/reservoirs/timeseries/
+# docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "short_range" -dt "2026-07-13 12:00:00" -rname "default_sr_no_da" -g "01205500"
+
 # State saving and loading
 docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "standard_ana" -dt "2026-03-30 06:00:00" -rname "default_ana" --save_state --save_state_dir /ngwpc/run_ngen/default/default_ana/${TEST_GAGE}/state_save_directory/
 docker_run python -um "ngen_rte.run_default" -n 2 -fconfig "standard_ana" -dt "2026-03-30 06:00:00" -rname "default_ana" --save_state
diff --git a/run_fcst.sh b/run_fcst.sh
index 5a389e9..8778c7f 100755
--- a/run_fcst.sh
+++ b/run_fcst.sh
@@ -61,4 +61,7 @@ docker_run python -um "ngen_rte.run_forecast" -dt "2025-09-15 00:00:00" -rname "
 # docker_run python -um "ngen_rte.run_forecast" -n 2 -dt "2025-09-15 00:00:00" -rname "${fcst_run_name}_mr_le" -fconfig medium_range -le "mem5" "" ""
 # docker_run python -um "ngen_rte.run_forecast" -n 2 -dt "2025-09-15 00:00:00" -rname "${fcst_run_name}_mr_le" -fconfig medium_range -le "mem6" "" ""
 
+# Reservoir RFC DA  (RFC reservoir test data only valid at "2026-07-13 12:00:00", default 01123000 gage does not have a reservoir)
+# docker_run python -um "ngen_rte.run_forecast" -dt "2025-07-13 12:00:00" -rname "${fcst_run_name}_short" -fconfig short_range -rfc /ngwpc/run_ngen/data/rfc/reservoirs/timeseries/
+
 exit 0
diff --git a/run_region_standalone.sh b/run_region_standalone.sh
index c0ad526..d8e3ee1 100755
--- a/run_region_standalone.sh
+++ b/run_region_standalone.sh
@@ -49,6 +49,9 @@ docker_run python -um "ngen_rte.run_regionalization_standalone" -n 2 -faf "${TES
 # Medium Range
 docker_run python -um "ngen_rte.run_regionalization_standalone" -n 2 -faf "${TEST_FORM_ASSIGN_GAGE}" -cgf "${TEST_CAT_GRP_GAGE}" -fconfig "medium_range_blend" -dt "2026-03-30 06:00:00" -rname "region_mr"
 
+# Reservoir RFC DA  (RFC reservoir test data only valid at "2026-07-13 12:00:00", default gage 01123000 does not have a reservoir)
+docker_run python -um "ngen_rte.run_regionalization_standalone" -n 2 -faf "${TEST_FORM_ASSIGN_VPU}" -cgf "${TEST_CAT_GRP_VPU}" -fconfig "short_range" -dt "2026-07-13 12:00:00" -rname "region_sr" -rfc /ngwpc/run_ngen/data/rfc/reservoirs/timeseries/ -v "03S"
+
 # Medium Range Lagged Ensemble
 # docker_run python -um "ngen_rte.run_regionalization_standalone" -n 2 -faf "${TEST_FORM_ASSIGN_GAGE}" -cgf "${TEST_CAT_GRP_GAGE}" -fconfig "medium_range" -dt "2026-03-30 06:00:00" -rname "region_mr_le" -le "no_da" "" ""
 # docker_run python -um "ngen_rte.run_regionalization_standalone" -n 2 -faf "${TEST_FORM_ASSIGN_GAGE}" -cgf "${TEST_CAT_GRP_GAGE}" -fconfig "medium_range" -dt "2026-03-30 06:00:00" -rname "region_mr_le" -le "mem1" "" ""
diff --git a/setup_data.sh b/setup_data.sh
index de7c983..eeba3b5 100755
--- a/setup_data.sh
+++ b/setup_data.sh
@@ -52,5 +52,8 @@ s3_sync "${SOURCE_BUCKET_DEV}/${SOURCE_PREFIX_ROOT}/calib_params_tab_delimited"
 # Download ESMF mesh files for NWM forcing (CONUS and oCONUS)
 s3_sync "${SOURCE_BUCKET_DEV}/${SOURCE_PREFIX_ROOT}/esmf/esmf_mesh" "${RUN_NGEN_ROOT__HOST}/data/esmf_mesh"
 
+# Download RFC reservoir gage timeseries data
+s3_sync "${SOURCE_BUCKET_DEV}/${SOURCE_PREFIX_ROOT}/rfc/reservoirs/timeseries" "${RUN_NGEN_ROOT__HOST}/data/rfc/reservoirs/timeseries"
+
 set -x
 exit 0