bridge plank; plank of a bridge
Refers to the individual wooden planks that form the surface of a bridge.
古い橋の橋板がきしんでいた。
The planks of the old bridge were creaking.
Compound of 橋 (hashi, 'bridge') and 板 (ita, 'board, plank'). The reading はしいた is a straightforward combination.