Not too many miles from here, I did find in a narrow canyon bottom with my old VLF-TR Garrett a couple years ago, what looks like a chunk of iron ore and is attracted to a magnet. I searched the area further and found no more. It however does not look quite the same as what you found, is more rough, but have saved it in my Detector Tool Box that I keep some test items in such as well oxidized coins, a bag of Black Sand, Hot and Cold rocks, and odd metal finds to practice with. I've never figured out how to make pictures fit here so have not posted any of my own.
I'm no geological or meteor expert but from what pictures I've seen and descriptions I've read, from what I see, I think I would go back to where you found this item to try and find more. If you have a GPS, save the approximate spot you found this one and get good readings on others you find so to maybe establish a debris field pattern.
Something I will share is I have found iron or steel items heavily rusted in and around the river. At first look, you will see shinny specks bound in the rust and will think it a very mineralized rock or of the sort but it is really particles of sand the rust has grown around. I've found what almost resembles very rusted weld slag drippings up to about a couple inches long that had the shinny specks in it and when broke and some do easily, I could see it was an old nail or piece of wire covered with many years of rust. Your item though is nicely rounded as I would expect a heated meteor fragment. Your mention of it being pitted is also a good indicator. I think what you will be looking for on it's surface is known as very tiny crater pits from heat and surface melting.
Nice picture, glad you shared, enjoyed it.