Letter to S.D. Woodruff from Fred Holmes stating that there are 4 bents in the Port Robinson Bridge over the Chippawa

Letter to S.D. Woodruff from Fred Holmes stating that there are 4 bents in the Port Robinson Bridge over the Chippawa. This is more than are shown in the plan, Oct. 5, 1857.

Note regarding discharge over waste weirs

Note regarding discharge over waste weirs. This is initialed by S.D. Woodruff, May 4, 1846.

Power of water discharged over breach of weir

Power of water discharged over breach of weir (1 page, handwritten), n.d.