diff --git a/host-configs/LLNL/lassen-base.cmake b/host-configs/LLNL/lassen-base.cmake
index a31bb5da36..b8014d6410 100644
--- a/host-configs/LLNL/lassen-base.cmake
+++ b/host-configs/LLNL/lassen-base.cmake
@@ -72,13 +72,6 @@ set(PYTHON_EXECUTABLE /usr/gapps/GEOSX/thirdPartyLibs/python/lassen-gcc-python/p
 set(Python3_ROOT_DIR /usr/gapps/GEOSX/thirdPartyLibs/python/lassen-gcc-python/python CACHE PATH "")
 set(Python3_EXECUTABLE /usr/gapps/GEOSX/thirdPartyLibs/python/lassen-gcc-python/python/bin/python3 CACHE PATH "")
 
-# Fortran
-set(CMAKE_Fortran_COMPILER /usr/tce/packages/gcc/gcc-8.3.1/bin/gfortran  CACHE PATH "")
-set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -DNDEBUG -mtune=power9" CACHE STRING "")
-set(FORTRAN_MANGLE_NO_UNDERSCORE ON CACHE BOOL "")
-set(OpenMP_Fortran_FLAGS "-fopenmp" CACHE STRING "")
-set(OpenMP_Fortran_LIB_NAMES "" CACHE STRING "")
-
 # ATS
 set(ATS_ARGUMENTS "--ats jsrun_omp --ats jsrun_bind=packed"  CACHE STRING "")
 
diff --git a/host-configs/LLNL/lassen-clang-10-cuda-11.cmake b/host-configs/LLNL/lassen-clang-10-cuda-11.cmake
index e0de78e26e..9c9ff7de26 100644
--- a/host-configs/LLNL/lassen-clang-10-cuda-11.cmake
+++ b/host-configs/LLNL/lassen-clang-10-cuda-11.cmake
@@ -1,9 +1,16 @@
 include(${CMAKE_CURRENT_LIST_DIR}/../../src/coreComponents/LvArray/host-configs/LLNL/lassen-clang-10-cuda-11.cmake)
 
+# Fortran
+set(CMAKE_Fortran_COMPILER /usr/tce/packages/xl/xl-2023.06.28/xlf/16.1.1/bin/xlf  CACHE PATH "")
+set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -DNDEBUG -qarch=pwr9 -qtune=pwr9" CACHE STRING "")
+set(FORTRAN_MANGLE_NO_UNDERSCORE ON CACHE BOOL "")
+set(OpenMP_Fortran_FLAGS "-qsmp=omp" CACHE STRING "")
+set(OpenMP_Fortran_LIB_NAMES "" CACHE STRING "")
+
 # MPI
 set(MPI_HOME /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-clang-10.0.1-gcc-8.3.1 CACHE PATH "")
 set(MPI_Fortran_COMPILER /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-xl-2023.06.28-cuda-11.8.0/bin/mpifort CACHE PATH "")
 
 include(${CMAKE_CURRENT_LIST_DIR}/lassen-base.cmake)
 
-set(ENABLE_CUDA_NVTOOLSEXT OFF CACHE BOOL "")
\ No newline at end of file
+set(ENABLE_CUDA_NVTOOLSEXT ON CACHE BOOL "")
\ No newline at end of file
diff --git a/host-configs/LLNL/lassen-clang-13-cuda-11.cmake b/host-configs/LLNL/lassen-clang-13-cuda-11.cmake
index 869245a979..c57f0014e5 100644
--- a/host-configs/LLNL/lassen-clang-13-cuda-11.cmake
+++ b/host-configs/LLNL/lassen-clang-13-cuda-11.cmake
@@ -1,5 +1,12 @@
 include(${CMAKE_CURRENT_LIST_DIR}/../../src/coreComponents/LvArray/host-configs/LLNL/lassen-clang-13-cuda-11.cmake)
 
+# Fortran
+set(CMAKE_Fortran_COMPILER /usr/tce/packages/xl/xl-2023.06.28/xlf/16.1.1/bin/xlf  CACHE PATH "")
+set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -DNDEBUG -qarch=pwr9 -qtune=pwr9" CACHE STRING "")
+set(FORTRAN_MANGLE_NO_UNDERSCORE ON CACHE BOOL "")
+set(OpenMP_Fortran_FLAGS "-qsmp=omp" CACHE STRING "")
+set(OpenMP_Fortran_LIB_NAMES "" CACHE STRING "")
+
 # MPI
 set(MPI_HOME /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-clang-13.0.1-gcc-8.3.1 CACHE PATH "")
 set(MPI_Fortran_COMPILER /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-xl-2023.06.28-cuda-11.8.0/bin/mpifort CACHE PATH "")
diff --git a/host-configs/LLNL/lassen-clang-13-cuda-12.cmake b/host-configs/LLNL/lassen-clang-13-cuda-12.cmake
index b2183c8c63..5129a2f4e3 100644
--- a/host-configs/LLNL/lassen-clang-13-cuda-12.cmake
+++ b/host-configs/LLNL/lassen-clang-13-cuda-12.cmake
@@ -1,5 +1,12 @@
 include(${CMAKE_CURRENT_LIST_DIR}/../../src/coreComponents/LvArray/host-configs/LLNL/lassen-clang-13-cuda-12.cmake)
 
+# Fortran
+set(CMAKE_Fortran_COMPILER /usr/tce/packages/xl/xl-2023.06.28/xlf/16.1.1/bin/xlf  CACHE PATH "")
+set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -DNDEBUG -mtune=power9" CACHE STRING "")
+set(FORTRAN_MANGLE_NO_UNDERSCORE ON CACHE BOOL "")
+set(OpenMP_Fortran_FLAGS "-fopenmp" CACHE STRING "")
+set(OpenMP_Fortran_LIB_NAMES "" CACHE STRING "")
+
 # MPI
 set(MPI_HOME /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-clang-13.0.1-gcc-8.3.1/ CACHE PATH "")
 set(MPI_Fortran_COMPILER /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-gcc-8.3.1/bin/mpifort CACHE PATH "")
diff --git a/host-configs/LLNL/lassen-gcc-8-cuda-11.cmake b/host-configs/LLNL/lassen-gcc-8-cuda-11.cmake
index af58f9632e..3e9fd6783d 100644
--- a/host-configs/LLNL/lassen-gcc-8-cuda-11.cmake
+++ b/host-configs/LLNL/lassen-gcc-8-cuda-11.cmake
@@ -5,8 +5,15 @@ include(${CMAKE_CURRENT_LIST_DIR}/../../src/coreComponents/LvArray/host-configs/
 set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG" CACHE STRING "" FORCE)
 set(CMAKE_CUDA_FLAGS_RELEASE "-O3 -DNDEBUG -Xcompiler -DNDEBUG -Xcompiler -O3" CACHE STRING "" FORCE)
 
+# Fortran
+set(CMAKE_Fortran_COMPILER /usr/tce/packages/gcc/gcc-8.3.1/bin/gfortran CACHE PATH "")
+set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -DNDEBUG -mcpu=power9 -mtune=power9" CACHE STRING "")
+set(FORTRAN_MANGLE_NO_UNDERSCORE OFF CACHE BOOL "")
+
 # MPI
 set(MPI_HOME /usr/tce/packages/spectrum-mpi/spectrum-mpi-rolling-release-gcc-8.3.1 CACHE PATH "")
 set(MPI_Fortran_COMPILER ${MPI_HOME}/bin/mpifort CACHE PATH "")
 
+set(ENABLE_CUDA_NVTOOLSEXT ON CACHE BOOL "")
+
 include(${CMAKE_CURRENT_LIST_DIR}/lassen-base.cmake)