diff --git a/A00_Common/design/design_view_profile.ts b/A00_Common/design/design_view_profile.ts
index 75eb2d58b..0ed5e9664 100644
--- a/A00_Common/design/design_view_profile.ts
+++ b/A00_Common/design/design_view_profile.ts
@@ -53,7 +53,6 @@ import {
   structureAnchorM,
 } from "../../B05_Profile/B05_Profile_Api_Structures";
 import { pipeToFacilityItem } from "../../B05_Profile/B05_Profile_UI_Structures_Panel_Types";
-import { saveCorridorIfDirty } from "../../B05_Profile/B05_Profile_UI_Corridor";
 import {
   profileSaveParts,
   type PageActionContext,
@@ -404,10 +403,6 @@ export async function mountProfileView(
       }
       profilePick.paint();
     },
-    // 보기를 떠나는 자리 = 코리도 영구저장 시점(2026-08-23 사용자 확정) — 이동은 막지 않는다.
-    onHide: () => {
-      if (state.latest?.route?.id) void saveCorridorIfDirty(activeProjectId, state.latest.route.id);
-    },
   });
 
   /** [노선 반영] 끝 — 서버가 배수유역부터 다시 셌고 그 결과가 새 초기값이다. 새로고침 대신 페이지를
diff --git a/A00_Common/design/design_view_profile_3d.ts b/A00_Common/design/design_view_profile_3d.ts
index 96f999fe7..833af8f2e 100644
--- a/A00_Common/design/design_view_profile_3d.ts
+++ b/A00_Common/design/design_view_profile_3d.ts
@@ -7,7 +7,7 @@
 
 import { showToast } from "@ui/ui_template_elements";
 import { updateContourInterval } from "../../B05_Profile/B05_Profile_Api_Fetch";
-import { refreshCorridor, saveCorridorIfDirty } from "../../B05_Profile/B05_Profile_UI_Corridor";
+import { refreshCorridor } from "../../B05_Profile/B05_Profile_UI_Corridor";
 import type { createLatestSource } from "../../B05_Profile/B05_Profile_UI_Page_Latest";
 import { toBounds } from "../../B05_Profile/B05_Profile_UI_Page_Helpers";
 import type { ViewControlCallbacks } from "../../B05_Profile/B05_Profile_UI_Panel_View";
@@ -64,8 +64,6 @@ export function createProfile3d(deps: Profile3dDeps) {
       );
       // 측점 바·라벨·램프도 계획고를 따라 움직여야 한다(2026-08-23 지적 ③).
       deps.sections().renderStationLines(detail);
-      // 만든 것을 **바로 올려 둔다**(2026-09-06) — 다음 진입이 네트워크 없이 선다.
-      void saveCorridorIfDirty(projectId, latest.route.id);
     },
   };
 
diff --git a/B05_Profile/B05_Profile_UI_Corridor.ts b/B05_Profile/B05_Profile_UI_Corridor.ts
index 7bf2963c5..321cd5de3 100644
--- a/B05_Profile/B05_Profile_UI_Corridor.ts
+++ b/B05_Profile/B05_Profile_UI_Corridor.ts
@@ -184,9 +184,6 @@ export async function ensureCorridor(
   return build;
 }
 
-/** 옛 올림 자리 — 3D 길 모형은 서버가 [저장]·[확정] 때 지음(342-2). 부르는 곳이 지워지면 함께 지움. */
-export async function saveCorridorIfDirty(_projectId: string, _routeId: number): Promise<void> {}
-
 /** ③ 사면이 읽을 측점 단면을 얹는다(115-1 · 저장본에는 안 담긴다). */
 function withSections(
   build: CorridorBuildResult | null,
diff --git a/B05_Profile/B05_Profile_UI_Page_Actions.ts b/B05_Profile/B05_Profile_UI_Page_Actions.ts
index 5d6fc7ef8..d4b27c095 100644
--- a/B05_Profile/B05_Profile_UI_Page_Actions.ts
+++ b/B05_Profile/B05_Profile_UI_Page_Actions.ts
@@ -13,7 +13,6 @@ import {
   invalidateSectionDetail,
   saveCachedCrossPatches,
 } from "../B06_Section/B06_Section_Section_Store";
-import { saveCorridorIfDirty } from "./B05_Profile_UI_Corridor";
 import type { createRoutePanel } from "./B05_Profile_UI_Panel";
 import type { createRouteProfilePanel } from "./B05_Profile_UI_Profile_Panel";
 import type { createStructuresBridge } from "./B05_Profile_UI_Page_Structures";
@@ -87,9 +86,6 @@ export function profileSaveParts(ctx: PageActionContext): DesignViewSave {
       // 서버가 종단 정본의 계획선을 다시 썼다 — 공유 캐시를 비워 횡단 보기가 옛 계획선을 못 보게 한다.
       invalidateSectionDetail(projectId);
       ctx.renderLatest(await ctx.loadLatest(true));
-      // 저장 = 코리도 영구저장 시점(2026-08-23) — 실패해도 저장은 성공 처리.
-      const routeId = ctx.latest()?.route?.id;
-      if (routeId) void saveCorridorIfDirty(projectId, routeId);
     },
   };
 }
diff --git a/B05_Profile/B05_Profile_UI_RouteEdit_Contour.ts b/B05_Profile/B05_Profile_UI_RouteEdit_Contour.ts
index a1b0f9cea..709e616e8 100644
--- a/B05_Profile/B05_Profile_UI_RouteEdit_Contour.ts
+++ b/B05_Profile/B05_Profile_UI_RouteEdit_Contour.ts
@@ -11,8 +11,7 @@
  * 그리기·라벨·집기가 출처를 안 가리게 한다.
  * ========================================================================== */
 
-import { API_BASE_URL } from "@config/config_frontend";
-import { fetchCachedJson } from "../A00_Common/b_asset_cache";
+import { contourAssetUrl, fetchCachedJson } from "../A00_Common/b_asset_cache";
 import {
   createNormalizer,
   type GeoJsonCollection,
@@ -71,8 +70,7 @@ export async function loadRouteEditContours(
       // 3D 뷰어가 쓰는 것과 **같은 파일**이다 — 보관함에 있으면 다시 내려받지 않는다.
       const data = await fetchCachedJson<ContourResponse>(
         projectId,
-        `${API_BASE_URL}/projects/${projectId}/surface/models/${options.surfaceModelId}` +
-          `/contour?interval=${interval}&smooth=${options.smooth}`,
+        contourAssetUrl(projectId, options.surfaceModelId, interval, options.smooth),
       );
       const all = data.contours ?? [];
       const onUnit = (level: number): boolean => Math.abs(level % LAS_CONTOUR_UNIT_M) < 1e-6;
diff --git a/B05_Profile/B05_Profile_UI_Viewer.ts b/B05_Profile/B05_Profile_UI_Viewer.ts
index 78f276413..619242cc5 100644
--- a/B05_Profile/B05_Profile_UI_Viewer.ts
+++ b/B05_Profile/B05_Profile_UI_Viewer.ts
@@ -4,7 +4,7 @@ import { createTerrainCompass } from "@ui/ui_template_compass";
 import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
 import { PLYLoader } from "three/examples/jsm/loaders/PLYLoader.js";
 import { API_BASE_URL } from "@config/config_frontend";
-import { fetchCachedBytes, fetchCachedJson } from "../A00_Common/b_asset_cache";
+import { contourAssetUrl, fetchCachedBytes, fetchCachedJson } from "../A00_Common/b_asset_cache";
 import { bindCursorPivotControls, TOP_VIEW_TILT } from "../B04_PreProcess/B04_PreProcess_UI_Camera";
 import {
   createRouteMarkers,
@@ -325,7 +325,7 @@ export function createRouteViewer(): RouteViewer {
       contours: Array<{ level: number; coordinates: [number, number, number][] }>;
     }>(
       current.projectId,
-      `${API_BASE_URL}/projects/${current.projectId}/surface/models/${current.modelId}/contour?interval=${interval}&smooth=${current.smooth}`,
+      contourAssetUrl(current.projectId, current.modelId, interval, current.smooth),
     );
     clearContours();
     // 등고선 한 가닥마다 3D 객체를 만들면 수백 개가 된다. 주곡선·보조곡선 두 덩어리로 합친다.
diff --git a/resources/tester/test_345_4_contour_one_url.py b/resources/tester/test_345_4_contour_one_url.py
new file mode 100644
index 000000000..b7db895b6
--- /dev/null
+++ b/resources/tester/test_345_4_contour_one_url.py
@@ -0,0 +1,35 @@
+"""345-4 정리 — B05 등고선 주소 한 벌(`contourAssetUrl` · 미리 받기와 같은 파일) · 빈 saveCorridorIfDirty 지움."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def _read(rel: str) -> str:
+    return (ROOT / rel).read_text(encoding="utf-8")
+
+
+def test_B05_등고선_주소는_한_벌():
+    for rel in (
+        "B05_Profile/B05_Profile_UI_Viewer.ts",
+        "B05_Profile/B05_Profile_UI_RouteEdit_Contour.ts",
+    ):
+        source = _read(rel)
+        assert "contourAssetUrl(" in source, rel
+        assert "/contour?interval" not in source, rel
+    # 미리 받기(b_asset_cache)도 같은 함수 — 주소가 같아야 보관함 한 칸을 같이 씀
+    assert "contourAssetUrl(projectId, confirmed.model_id, interval, smooth)" in _read(
+        "A00_Common/b_asset_cache.ts"
+    )
+
+
+def test_빈_코리도_올림_함수_지움():
+    for rel in (
+        "B05_Profile/B05_Profile_UI_Corridor.ts",
+        "B05_Profile/B05_Profile_UI_Page_Actions.ts",
+        "A00_Common/design/design_view_profile.ts",
+        "A00_Common/design/design_view_profile_3d.ts",
+    ):
+        assert "saveCorridorIfDirty" not in _read(rel), rel