BBS Methodology - The BBS Route [page
Stops are supposedly located at 0.5-mile (800 m) intervals; however,
car odometers vary in accuracy, and safety issues may dictate
some deviation from this ideal.
- The most important issue concerning stops is that all 50 stops
should be made in exactly the same location from year to year.
If your route map has stops marked on it or a list of stop descriptions
attached, use those regardless of what your odometer or GPS unit
indicates unless the marked stop locations are entirely unreasonable
– in which case contact the BBS office.
Update the stop descriptions each year as necessary and send copies
to the BBS office. If no stop descriptions exists, please develop
a set and submit a copy to the BBS office
along with the route map.
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Laurel, MD, USA 20708-4038
Operations Contact: Keith
Pardieck, email: Keith_Pardieck@usgs.gov
Analyses Contact: John Sauer,
Last Modified: 10/31/01
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