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| Safety guy | | Line rigged under the bull block to take it to ... |
| Safety Swede | | Lever used to tighten binders on loaded logging trucks ... |
| Sag | | Slack in a cable, particularly in a skyline ... |
| Salvage logging | | Cleanup operation, generally with a small crew and light equipment, ... |
| Sand bolster | | Part of a landing gear that rests on the ground, ... |
| Sapling | | Young tree less than 4 inches in d.b.h. The minimum ... |
| Saw logs (sawlogs) | | Logs meeting minimum regional standards of diameter, length, and defect. ... |
| Sawing fat | | Sawing lumber unnecessarily thick, wastefully. ... |
| Sawlog portion | | That part of the bole of sawtimber trees between the ... |
| Sawtimber | | Trees suitable for production of saw logs ... |
| Sawyer | | 1.) A worker in a sawmill who operates the headrig, ... |
| Scale | | To measure the weight or volume of a log or ... |
| Scaling | | Determination of the gross and net volume of logs using ... |
| Scalping | | Removing small plants and duff or ashes from around the ... |
| scantling | | A small length of lumber, usually dimensional lumber used for ... |
| Scarification | | Shallow loosening of the soil surface ... |
| Scheduled nonoperating time | | Time when no production is scheduled for a machine. ... |
| Schoolmarm | | Tree that initially had a single trunk that later split ... |
| Scoot | | Two-runner sled, without tongue or shafts, used to haul logs ... |
| Scribner rule | | Diagram log rule, one of the oldest in existence, that ... |
| Sealed bid sale | | Sale in which interested parties submit written bids at the ... |
| Seasoned | | Wood that has been dried to a certain moisture content ... |
| Seasoning | | The process of evaporation and extraction of moisture from green ... |
| Second growth | | Trees that come up naturally after the first growth of ... |
| Secondary logging road | | Road designed for relatively little use. Typically a dirt road, ... |
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