diff --git a/B04_PreProcess/B04_PreProcess_Router_Inflow.py b/B04_PreProcess/B04_PreProcess_Router_Inflow.py
index 594e143a..ab520978 100644
--- a/B04_PreProcess/B04_PreProcess_Router_Inflow.py
+++ b/B04_PreProcess/B04_PreProcess_Router_Inflow.py
@@ -27,7 +27,7 @@ from B04_PreProcess.B04_PreProcess_Engine_Watershed_Grid import GridSpec
 from B05_Profile.B05_Profile_Repository import get_surface_crs_epsg
 from common_util.common_util_route_geometry import (
     find_planned_route_file,
-    read_planned_route_csv,
+    read_planned_route,
 )
 from common_util.common_util_storage import resolve_stored_project_path
 from config.config_db import get_db_pool
@@ -80,7 +80,7 @@ async def _resolve_epsg(project_id: UUID, stored_path: str) -> str:
         epsg = await get_surface_crs_epsg(connection, project_id, 0)
     project_root = Path(resolve_stored_project_path(stored_path))
     route_file = find_planned_route_file(project_root / "B03_FileInput" / "input")
-    planned = read_planned_route_csv(route_file) if route_file else None
+    planned = read_planned_route(route_file) if route_file else None
     source = (planned.epsg if planned else None) or epsg or 5186
     return f"EPSG:{source}"
 
diff --git a/B04_PreProcess/B04_PreProcess_Router_Watershed.py b/B04_PreProcess/B04_PreProcess_Router_Watershed.py
index 54949168..d77acbc9 100644
--- a/B04_PreProcess/B04_PreProcess_Router_Watershed.py
+++ b/B04_PreProcess/B04_PreProcess_Router_Watershed.py
@@ -39,7 +39,7 @@ from B05_Profile.B05_Profile_Repository import get_surface_crs_epsg
 from common_util.common_util_route_geometry import (
     StructureCandidate,
     find_planned_route_file,
-    read_planned_route_csv,
+    read_planned_route,
 )
 from common_util.common_util_storage import resolve_stored_project_path
 from common_util.common_util_wamis_rainfall import (
@@ -172,7 +172,7 @@ async def _prepare(project_id: UUID) -> dict[str, Any] | JSONResponse:
             status_code=404,
             content={"status": "error", "message": "계획 노선 파일이 업로드되지 않았습니다."},
         )
-    planned = read_planned_route_csv(route_file)
+    planned = read_planned_route(route_file)
     if planned is None or len(planned.vertices) < 2:
         return JSONResponse(
             status_code=400,
@@ -246,7 +246,7 @@ def _route_center_lonlat(stored_path: str, fallback_epsg: int | None) -> tuple[f
     route_file = find_planned_route_file(_route_input_dir(stored_path))
     if route_file is None:
         return None
-    planned = read_planned_route_csv(route_file)
+    planned = read_planned_route(route_file)
     if planned is None or not planned.vertices:
         return None
     middle = planned.vertices[len(planned.vertices) // 2]
diff --git a/common_util/common_util_drainage_context.py b/common_util/common_util_drainage_context.py
index 9bc3b0f3..bce2711f 100644
--- a/common_util/common_util_drainage_context.py
+++ b/common_util/common_util_drainage_context.py
@@ -31,7 +31,7 @@ from common_util.common_util_route_geometry import (
     RouteVertex,
     build_route_vertices,
     find_planned_route_file,
-    read_planned_route_csv,
+    read_planned_route,
 )
 from common_util.common_util_route_profile import Z_SOURCE_CSV, resolve_route_profile
 from common_util.common_util_storage import resolve_stored_project_path
@@ -114,7 +114,7 @@ async def load_drainage_context(project_id: UUID) -> tuple[DrainageContext | Non
 def _read_planned_route(project_root: Path):
     """원청 계획노선 CSV를 찾아 읽는다(파일 접근이라 스레드에서 돈다)."""
     path = find_planned_route_file(project_root / _INPUT_SUBDIR)
-    return read_planned_route_csv(path) if path else None
+    return read_planned_route(path) if path else None
 
 
 def _open_sampler(project_root: Path, surface_params: dict[str, Any]):