Trained Lead Observers certified to assess stream crossings use uniform assessment protocols throughout the thirteen-state, North Atlantic region. The certification system for terrestrial passability assessments is coming soon.
Terrestrial passability assessments include observations and measurements of the entire crossing (for example road type, flow condition, crossing alignment) and of one or more structures (e.g. culverts) that make up the crossing (for example material, shape, dimensions). The NAACC Terrestrial Stream Crossing Survey Instruction Guide explains this survey protocol for use with either paper field data forms or an electronic version of the forms - the offline data manager (ODM) - that can be used with smart phones, tablets and laptop computers.
The field data form and instruction manual for this protocol are available under NAACC Documents.