catpiece

\\ˈ ̷ ̷ˌ ̷ ̷\ noun

: a stick with holes at regular intervals into which uprights fastened in floating booms are fitted so as to regulate the width of a logging sluiceway entrance

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catpiece U.S.

(ˈkætpiːs)

[f. cat n.¹ + piece n.]

In logging, a perforated bar of wood fitting on the tops of uprights in floating booms, so that the space between the booms may be narrowed when necessary.

in Terms Forestry & Logging 33.