Conventional Construction Methods and Materials for Floating Structures and Walkways Using Log Support Systems.
Walkways leading to floating structures. Floating walkway supports may consist of preservative treated 6 inch x 6 inch wood stringers not more than 6 feet-0 inches on center or preservative treated 4 inch x 6 inch wood stringers not more than 5 feet-0 inches on center. Steel stringers of a size to provide equivalent bearing surface and load capacity as a wood stringer may be used for similar conditions. Stringers shall be anchored to the logs with headed steel rods (pins) as described above. Single headed steel rods (pins) may be used at interior logs. Maximum joist spacing is 2 feet-0 inches on center.
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https://www.portlandoregon.gov/citycode/article/178830
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