HEC-RAS Known Issues

02 Jun 2026 HEC-RAS 7.0.1

Reported problems with previous versions can be seen by choosing the Versions drop down in the upper right corner of this page.

HEC-RAS 7.0.1

Calibration Region Table Changes Not Triggering Property Table Recomputation with "Composite Classification Values in Cells" On	If a 2D area has "Composite Classification Valeus in Cells" turned on, and table data is changed for calibration regions, then HEC-RAS will fail to recompute property tables. *Workaround:* Manually recompute property tables in RAS Mapper by right clicking the 2D Flow Areas layer and selecting "Compute 2D Flow Areas Hydraulic Tables"	RESOLVED
Inaccurate Boundary Condition Line Faces in RAS Mapper.	The "affected" faces shown in RAS Mapper for external boundary condition lines are inaccurate, it is only a visual bug, and does not represent actual "affected" faces. *Workaround:* Use the geometry schematic to see true "affected" faces	IN PROGRESS
Bridge Plot - 1D Velocity Distribution	1D Velocity Distribution Plot for Unsteady Flow models is not displaying the correct number of slices for Bridge plots. One velocity for the channel and each overbank is shown. The plot was corrected for Cross Sections in version 7.0.1.	IN PROGRESS
Pipe Network Gate + Hydraulic Structure Gate Access Violation	When a dataset contains a sluice gate in a Pipe Network and a gate on an SA/2D Connection or Lateral Structure a Fortran access violation can occur, preventing the model from running. *Workaround:* Change the ordering of the gate boundary conditions in the .u## file so that the Pipe Network gate entries come before the other gate entries as described here: Reorder Gates in Unsteady Flow File	IN PROGRESS

Unable to Import WPC - QPF data in GRIB2 format	The National Weather Service's Weather Prediction Center provides 2 national gridded precipitation products in GRIB2 format: Quantitative Precipitation Estimates (QPE) and Quantitative Precipitation Forecasts (QPF). Currently, RAS is unable to import the QPF dataset due to its compression type. Workaround: Use HEC-MetVue or HEC-Vortex to convert the QPF data to DSS before use in RAS.	FUTURE VERSION
Unable to Create Terrains from GeoTIFFs Exported from CAD Application	HEC-RAS geospatial libraries cannot determine the projection data stored in GeoTIFFs exported from a common CAD application. This results in a failure when importing the geotiff to a RAS terrain. Workaround: Reproject the terrain to a desired projection in a GIS application before importing. Alternatively, import the terrain in RAS before defining a projection in Mapper, then set the appropriate projection (spatialreference.org) following import.	FUTURE VERSION
GDAL Conflict when Opening RAS Mapper	**"Error initializing the GDAL path variables. Please check HEC-RAS installation"** error message is displayed when attempting to open RAS Mapper.	View Discussion

¹ RESOLVED - issue is fixed and will be available in the next release.
² IN PROGRESS - issue is currently being worked on.
³ IMPROVED - the next version includes an incremental improvement but not a total fix.
⁴ FUTURE VERSION - this requires a structural change or major development. The team will add it to a future version if funding permits.