| RecType | | Physical quantity | Record type |
| Date | | Date/time | Date of sample collection |
| TransectName | | Nominal | Links to Transect datatable |
| SurveyEventID | | Physical quantity | autonumber field, unique value for each event |
| BirdRecordID | | Physical quantity | autonumber field, unique value for each observation |
| SpeciesCode | | Nominal | Official 4-letter bird species code from the American Ornithological Society. See Bird Species (CBS064) for full common names |
| Count | | Physical quantity | Number of individuals in group detected at the same time (birds had to be together, such as a flock flying together or a pair of birds) |
| Sex | | Nominal | sex of bird. "U" = unknown, "M"=Male, "F"=Female, "MF"=males and females in group |
| ObsLocation | | Physical quantity | Location of the observer along the line in meters. 0 is at the start, 300 is typically the end (although end may be a slightly different number because of differences in how distance measured in GIS and using a GPS in the field. Also, the last segments of old transects typically substantially shorter than 300 m). |
| Angle | | Physical quantity | Angle from observer to bird in degrees (0-360) |
| AngularDistance | | Physical quantity | Distance from observer to bird, estimated or measured with rangefinder in meters. |
| Flyover | | Nominal | TRUE if the bird did not interact with the watershed other than flying over |
| AudioOnly | | Nominal | TRUE if the observer only heard and did not see the bird |
| OffWatershed | | Nominal | TRUE if the bird was beyond the boundaries of the watershed |
| BeyondLine | | Nominal | TRUE if the bird was beyond a line perpendicular with the end of the transect line |
| Comments | | Nominal | Comments for the data |
