How to Build a Log Bridge

Instructions and diagrams for constructing a simple log bridge.



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Fig. 1.     
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Fig. 2.    
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How to Build a Bridge Final Product
Rick Compton and Hoy Gross build a log bridge at the MOTHER EARTH NEWS Ecovillage.
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Fig. 4.    
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Fig. 3.    
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Fig. 8.    
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Fig. 10.    
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Fig. 15.    
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Fig. 16. 
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Fig. 14.    
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Calculations. 
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Calculate the log diameter needed to hold the load you plan to place on the structure. 
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Fig. 17. 
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Rearranging this new equation to get a minimum diameter, we find that: 
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How to Build a Bridge Support Graph
Theoretical log diameters necessary to hold a quarter of a 65,000 pound concrete truck for 10- to 24-foot-long bridges.
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