The official HEC-GeoHMS software for ArcGIS 10.8 is no longer actively developed or supported by the Hydrologic Engineering Center (HEC). As of April 2021, HEC integrated GIS capabilities directly into HEC-HMS 4.8+, making the standalone GeoHMS extension largely obsolete for newer projects.
primarily lists archived versions up to 10.2, the 10.8 setup is maintained within Esri's ArcHydro distribution folders. community.esri.com Post: Getting HEC-GeoHMS Running on ArcGIS 10.8 download hec geohms for arcgis 108 exclusive
If you are looking for the most stable and verified version, the US Army Corps of Engineers HEC-GeoHMS Download Page is the primary authority. The official HEC-GeoHMS software for ArcGIS 10
.exe for ArcGIS 10.x.Because HEC no longer actively updates GeoHMS for newer ArcMap versions, you may need to use these specific sources: A dedicated HEC-GeoHMS toolbar with buttons like Basin
It is important to note that HEC-GeoHMS is entering its "sunset" phase. As of 2021, the HEC team announced they are no longer investing in HEC-GeoHMS development. Instead, they are integrating these GIS capabilities directly into HEC-HMS. HEC-GeoHMS Downloads - Hydrologic Engineering Center