LiDAR data is becoming more and more common, but the geographic extent and availability varies by state. There are several online viewers that you can use. At the national level the National Map may give you what you are looking for.
Turn on the "3DEP Elevation - Hillshade" layer to see the "bare earth", which may reveal old grades depending on the quality of the data for the particular location you are interested in.
Many states provide something similar. For example the following link shows LiDAR data availability in Oregon. "Bare Earth hillshade" is what you want to look at.
Hope that helps