diff --git a/loko/assets/static/assets/asset_add_modal.js b/loko/assets/static/assets/asset_add_modal.js
index f201b11..3be3477 100644
--- a/loko/assets/static/assets/asset_add_modal.js
+++ b/loko/assets/static/assets/asset_add_modal.js
@@ -20,6 +20,18 @@
 
     const categoriesCache = {};
 
+    function populateCategorySelectIfEmpty(select, categories) {
+        if (!select || select.options.length > 1 || !categories || categories.length === 0) {
+            return;
+        }
+        categories.forEach(cat => {
+            const option = document.createElement('option');
+            option.value = cat.id;
+            option.textContent = cat.name;
+            select.appendChild(option);
+        });
+    }
+
     function initializeForm(form, modalId) {
         const thematicCode = form.dataset.thematic;
         const categorySelect = form.querySelector('.asset-category-select');
@@ -31,17 +43,22 @@
         const submitBtn = form.querySelector(`#${modalId}Submit`);
 
         // Fetch and cache categories for this thematic
-        if (thematicCode && !categoriesCache[thematicCode]) {
-            fetch(`/assets/${thematicCode}/categories/`)
-                .then(response => response.json())
-                .then(data => {
-                    if (data.categories) {
-                        categoriesCache[thematicCode] = data.categories;
-                    }
-                })
-                .catch(error => {
-                    console.error('Error prefetching categories:', error);
-                });
+        if (thematicCode) {
+            if (categoriesCache[thematicCode]) {
+                populateCategorySelectIfEmpty(categorySelect, categoriesCache[thematicCode]);
+            } else {
+                fetch(`/assets/${thematicCode}/categories/`)
+                    .then(response => response.json())
+                    .then(data => {
+                        if (data.categories) {
+                            categoriesCache[thematicCode] = data.categories;
+                            populateCategorySelectIfEmpty(categorySelect, data.categories);
+                        }
+                    })
+                    .catch(error => {
+                        console.error('Error prefetching categories:', error);
+                    });
+            }
         }
         
         async function onCategoryChange() {
diff --git a/loko/assets/templates/assets/components/add_asset_modal.html b/loko/assets/templates/assets/components/add_asset_modal.html
index 2479f99..b40b4a9 100644
--- a/loko/assets/templates/assets/components/add_asset_modal.html
+++ b/loko/assets/templates/assets/components/add_asset_modal.html
@@ -23,6 +23,12 @@
                 {% if intervention_id %}
                 <input type="hidden" name="intervention_id" value="{{ intervention_id }}">
                 {% endif %}
+                {% if location %}
+                <input type="hidden" name="location_id" value="{{ location.id }}">
+                {% endif %}
+                {% if structure %}
+                <input type="hidden" name="structure_id" value="{{ structure.id }}">
+                {% endif %}
                 <input type="hidden" name="thematic_code" value="{{ thematic_code }}">
                 
                 <div class="modal-body">
diff --git a/loko/assets/templates/assets/structures_location_detail.html b/loko/assets/templates/assets/structures_location_detail.html
index 17583e0..ecb7e53 100644
--- a/loko/assets/templates/assets/structures_location_detail.html
+++ b/loko/assets/templates/assets/structures_location_detail.html
@@ -382,7 +382,7 @@
 
 <!-- Add Asset Modal -->
 {% if can_create_assets %}
-{% include "assets/components/add_asset_modal.html" with modal_id="addAssetLocationModal" thematic_code="structures" location=location %}
+{% include "assets/components/add_asset_modal.html" with modal_id="addAssetLocationModal" thematic_code="structures" location=location categories=categories %}
 {% endif %}
 
 {% endblock content%}
diff --git a/loko/assets/tests.py b/loko/assets/tests.py
index 8095d6b..853b0f9 100644
--- a/loko/assets/tests.py
+++ b/loko/assets/tests.py
@@ -374,6 +374,65 @@ class CategoryAllowedModelTest(TestCase):
         self.assertFalse(accessory_model["is_model_required"])
 
 
+class StructuresLocationDetailAddAssetModalTest(TestCase):
+    def setUp(self):
+        from common.models import Role
+        from assets.models.structures import Structure, StructureLocation
+        from django.contrib.gis.geos import Point
+
+        self.user = User.objects.create_superuser(username="admin_struct", password="password123")
+        self.config = UserConfig.objects.create(user=self.user, is_intern=True)
+        admin_role, _ = Role.objects.get_or_create(name="admin")
+        self.config.roles.add(admin_role)
+
+        self.thematic, _ = Thematic.objects.get_or_create(
+            code="structures",
+            defaults={"name_fr": "Ouvrages d'art", "name_nl": "Kunstwerken"}
+        )
+        UserThematics.objects.create(
+            user_config=self.config,
+            thematic=self.thematic,
+            can_view_assets=True,
+            can_edit_assets=True
+        )
+
+        self.category, _ = AssetCategory.objects.get_or_create(
+            code="TU_BAL_TEST",
+            defaults={
+                "name_fr": "Balisage Test",
+                "name_nl": "Balisage Test NL",
+                "thematic": self.thematic
+            }
+        )
+
+        from django.contrib.gis.geos import MultiPolygon, Polygon
+        poly = Polygon(((0, 0), (0, 1), (1, 1), (1, 0), (0, 0)))
+        mpoly = MultiPolygon(poly, srid=3812)
+
+        self.structure = Structure.objects.create(
+            code="OA_TEST_01",
+            name_fr="Pont Test",
+            structure_type="bridge"
+        )
+        self.location = StructureLocation.objects.create(
+            code="LOC_TEST_01",
+            name_fr="Localisation Test",
+            structure=self.structure,
+            geom=mpoly
+        )
+
+    def test_structures_location_detail_contains_categories(self):
+        self.client.force_login(self.user)
+        response = self.client.get(reverse("assets:structures_locations_detail", args=[self.location.id]))
+        self.assertEqual(response.status_code, 200)
+        self.assertIn("categories", response.context)
+        categories_in_context = response.context["categories"]
+        self.assertTrue(any(c.id == self.category.id for c in categories_in_context))
+        self.assertContains(response, "Balisage Test")
+        self.assertContains(response, f'name="location_id" value="{self.location.id}"')
+
+
+
 from assets.views.trafficlights import parse_dxf_poles
 
 @tag('slow', 'dxf')
diff --git a/loko/assets/views/structures.py b/loko/assets/views/structures.py
index cc02bdf..a7465c7 100644
--- a/loko/assets/views/structures.py
+++ b/loko/assets/views/structures.py
@@ -621,10 +621,15 @@ def structures_locations_detail(request, location_id):
 
     geom = json.loads(location_geom_4326.geojson) if location_geom_4326 else None
 
+    # Récupérer les catégories d'assets pour la thématique "structures"
+    categories = list(AssetCategory.objects.filter(thematic__code='structures'))
+    categories.sort(key=lambda m: m.get_name().lower())
+
     return render(request, "assets/structures_location_detail.html", {
         "location": location,
         "interventions": interventions,     # toutes les interventions de l'arbre
         "assets": assets,
+        "categories": categories,
         "main_documents": main_documents,
         "other_documents": other_docs,
         "add_document_form": StructureDocumentForm(),