"NH stream crossing guidelines" means the New Hampshire Stream Crossing Guidelines published by the University of New Hampshire dated May 2009, which can be downloaded for free at https://www.des.nh.gov/sites/g/files/ehbemt341/files/documents/2020-01/lrm-unh-stream-crossing.pdf.
N.H. Admin. Code § Env-Wt 902.18
#9714, eff 5-12-10