Gunpowder Falls

Does anyone know who created this post about this portion of the Gunpowder?

I created a river tubing MD resource http://tubing-maryland.com and I'm looking to add water level information to the site for this location and other tubing MD locations. I see this site has pulled in this data and is displaying it and I wonder where I can find this data? MOre specifically is their an API for me to the pull water level data for this point and display it on my site.

thank you,
ryan spahn