Before downloading, ensure the following:
HEC‑GeoHMS is a widely used ArcGIS extension that preprocesses GIS data for HEC‑HMS hydrologic modeling. ArcGIS 10.8 uses the ArcMap/ArcGIS Desktop platform, so this guide focuses on obtaining and installing the correct HEC‑GeoHMS version compatible with ArcGIS 10.8.
Cause: ArcGIS 10.8 uses Python 2.7, but HEC-GeoHMS scripts may call outdated libraries.
Fix: Install Microsoft Visual C++ Redistributable 2015–2022 (both x86 and x64).
The file name typically looks like:
HEC-GeoHMS_1033_Setup.exe (approx. 150–200 MB)
No registration, payment, or “exclusive” access code is required.
HEC provides an MD5 checksum. Verify it using:
CertUtil -hashfile HEC-GeoHMS_1033_Setup.exe MD5
If it doesn't match, do not install.
Open ArcMap:
For engineers and hydrologists running ArcGIS 10.8, the exclusive and final compatible release is HEC-GeoHMS 10.2.2, downloadable only from the official USACE HEC website. Follow the steps above to ensure a stable, functional integration. Do not search for a non-existent “GeoHMS 10.8” – version 10.2.2 is the correct and final exclusive build for your environment. download hec geohms for arcgis 108 exclusive
Document version: 1.0 – Validated for ArcGIS 10.8.x
To download and install HEC-GeoHMS for ArcGIS 10.8 , you can follow this guide . Note that while the U.S. Army Corps of Engineers (HEC)
officially supports only up to version 10.2, an unofficial or community-distributed version for 10.8 is commonly used in professional circles. Esri Community 1. Download the Installation Package Official Repository (Legacy) HEC GeoHMS Downloads
page lists version 10.2 as the last officially tested version. ArcGIS 10.8 Compatible Version : Users often download the 10.8-specific setup from the Esri ArcHydro FTP/Downloads site, which hosts newer community versions. Hydrologic Engineering Center (.mil) 2. Prerequisites ArcGIS Desktop (ArcMap) 10.8 : Must be already installed. Extensions Spatial Analyst 3D Analyst extensions licensed and enabled. Arc Hydro Tools
: It is strongly recommended to install the matching version of Arc Hydro Tools for 10.8 before installing GeoHMS, as many functions are shared. Esri Community 3. Installation Steps Run the Installer : Double-click the downloaded file (e.g., HEC-GeoHMS108.exe Follow the Wizard
, accept the license terms, and choose the default installation directory. Enable the Extension ArcMap 10.8 Go to the top menu:
To download HEC-GeoHMS for ArcGIS 10.8 , you should use the official Esri Arc Hydro download server, as the U.S. Army Corps of Engineers (HEC) has stopped active development for this extension. Hydrologic Engineering Center (.mil) Primary Download Source
The most reliable source for HEC-GeoHMS versions compatible with ArcGIS 10.8.x is the Esri Arc Hydro Download Site Version Check : Look for files labeled with Before downloading, ensure the following: HEC‑GeoHMS is a
in the directory to ensure compatibility with your specific ArcMap build. Official HEC Site : While the HEC Downloads page
provides legacy installers (like version 4.2.92), these are often for older versions of ArcGIS and may not include the 10.8 specific builds found on Esri's server. Esri Community Installation & Compatibility Notes Prerequisites : HEC-GeoHMS requires ArcGIS Desktop (ArcMap) Spatial Analyst extension to be installed and licensed. Installation Order
: To avoid common errors, users are advised to uninstall any existing versions of HEC-GeoHMS and Arc Hydro first. Reinstall before installing HEC-GeoHMS The Modern Alternative
: As of April 2021, HEC no longer supports HEC-GeoHMS. Its features (delineation, basin characteristics, etc.) have been integrated directly into HEC-HMS version 4.8
and newer, which no longer requires a separate GIS extension. Esri Community or help troubleshooting a specific error code during the setup process? Hecgeo-HMS Error - Esri Community
I suggest that you reinstall Arc Hydro and HEC-GeoHMS. Please follow this process (in this specific order): uninstall HEC-GeoHMS ( Esri Community HEC-GeoHMS Downloads - Hydrologic Engineering Center
The process of downloading HEC-GeoHMS for ArcGIS 10.8 involves navigating shifting software support from the U.S. Army Corps of Engineers (USACE) and utilizing specific ESRI archive links. While the USACE has largely integrated these capabilities directly into HEC-HMS 4.8 and newer, users of legacy systems like ArcGIS 10.8 still require the standalone extension. Compatibility and Support Status
HEC-GeoHMS was originally developed as a geospatial hydrology toolkit to bridge GIS data with HEC-HMS modeling. However, the Hydrologic Engineering Center (HEC) has officially ceased further development and support for the extension. Instead, they recommend using the GIS tools built into newer versions of HEC-HMS 4.13, which perform subbasin and reach characteristics computation without needing an external GIS extension. Downloading for ArcGIS 10.8 If it doesn't match, do not install
For users specifically tied to ArcGIS Desktop 10.8, there is a dedicated setup file maintained in the Arc Hydro archives. Community documentation and ESRI forums point to a specific directory for this version: Official Esri Archive Link: Setup for ArcGIS 10.8.
Alternative Versions: Earlier versions (e.g., for 10.2 or 10.1) can be found in the General Arc Hydro/HECGeoHMS Directory. Installation Prerequisites
To successfully run HEC-GeoHMS 10.8, your system must meet several strict requirements: ArcGIS Desktop 10.8: A valid installation of ArcMap 10.8.x.
Advanced License: Often requires an Advanced level license (formerly ArcInfo).
Extensions: You must have both Spatial Analyst and 3D Analyst extensions enabled.
Arc Hydro Tools: It is strongly recommended to install the matching version of Arc Hydro Tools first, as many HEC-GeoHMS functions rely on Arc Hydro's underlying data structures. The Shift to Built-in GIS Tools
If you are starting a new project, consider whether you need the extension at all. Starting with HEC-HMS 4.8, the HEC-HMS software itself includes an internal GIS environment that allows for watershed delineation and parameter estimation without ArcGIS. This is now the "exclusive" focus of the development team.
On the HEC-GeoHMS page: