This specific 3D model, "Bridge 3D Model 3D model 4", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 71.5 MB), OBJ (OBJ, filesize: 105 MB), USDZ (USDZ, filesize: 130 MB), PNG (PNG, filesize: 52.3 MB), FBX (Autodesk FBX, filesize: 181 MB), GLTF (glTF, filesize: 75.5 MB), BLEND (Blender, filesize: 483 MB)