Build a Log Bridge

Here is a minimally disruptive method of building a log bridge across a stream.



142 log bridge - photo 5 - planks
The finished log bridge looked like this. The 2 x 12 boards running the length of the bridge provide a track for car or tractor tires.
PHOTO: MOTHER EARTH NEWS STAFF
142 log bridge - photo 1- using a winch
The author used a tractor and winch to haul logs for the log bridge without harming the stream bed. 
MOTHER EARTH NEWS STAFF
142 log bridge - diagram 3 - A-frame
Diagram shows method of making an "A" frame or tripod to provide an anchor point for a pulley, as well securing a 12' bunker log.
SCOTT MACNEILL
142 log bridge - diagram 4 - water level
Diagram shows method of using a simple water level to determine if the bunker logs on each side of the stream are at the same height.
SCOTT MACNEILL
142 log bridge - diagram 1 - aparatus
Diagram shows method of using truck winch, pulley, and bunker log to maneuver a span log across the stream.
SCOTT MACNEILL
142 log bridge - diagram 5 - placing span log
Diagram shows method of using a forked stick to mark a curve on a span slog, which can then be cut to fit snugly against the bunker log. Position span logs with their curved side up, because logs will sag over time.
SCOTT MACNEILL
142 log bridge - photo 2 - putting logs in place
A tripod provides a stable pulling point above the stream bed.
MOTHER EARTH NEWS STAFF
142 log bridge - photo 3 - cutting saddle
Rough-trim the log tops so that they fit the planks of the bridge.
MOTHER EARTH NEWS STAFF
142 log bridge - photo 4 - leveling2
A string run from corner to corner will reveal whether your span logs are level. 
MOTHER EARTH NEWS STAFF
142 log bridge - diagram 2 - crossing strings
Run string diagonally across the bridge, forming an "X" in the middle, to determine if the span logs are more or less level.
SCOTT MACNEILL











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