Per provided link https://www.usds.gov/apply:
"Salaries in government change every year. For 2023, you may be paid up to $183,500 depending on where you are located in the United States."
I've got a few friends at JPL and they are paid around that.
I was a researcher under UC Regents many years ago, run by the state of California. That pay, however, was terrible. When I left for private industry I asked for double what I had been making and they considered me a bargain.
Not compared to what private companies could be paying them.