how to get 10 or 20 ft contour lines

My main Gaia use is on small land areas I use - 150 to 300 acres.  I haven't found a map layer with contour lines closer than 40'.  This misses a lot of detail.  The county GIS sites routinely have 20 foot contours, and even offer 10' as an option.  Yes, that gets busy, but sure helps in understanding where my tracks or boundaries really lay on the land.

Anybody found how to get 10' contours on Gaia?