This specific 3D model, "Wooden Bridge Low-poly 3D model 3", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 100 KB), OBJ (OBJ, filesize: 156 KB), BLEND (Blender, filesize: 936 KB), ABC (Alembic, filesize: 97.2 KB), FBX (Autodesk FBX, filesize: 78.3 KB), DAE (Collada, filesize: 258 KB)