As stated above, if you get a hand from Local NRCS they should be able to tell you #1, If it's a drainage into a tributary in which case they can advise on forward progress and #2, if there was any possibility of it being a recognized wetland area, and 3, if none of the previous conditions exist they can advise what you can or can't do as far as "Damming" something up. Most states have different laws when it comes to surface water but NRCS is likely the best bet in who to talk to. They can help you out I'm sure.