A copy of a detailed survey blueprint of the entire canal system including structures and property ownership details was donated (date unknown) by the Safe Harbor Water Power Corporation to Millersville University (assessed on 10/06/2016 in the MU Archives at Sp.

An original copy (undated) of the survey is located in the Archives of Safe Harbor Dam as of 2022 (Brookfield Renewable).

Therein it specifically confirms that Mr Dechant, a young surveyor for Reading Railroad, completed the survey in 1875 from Columbia, PA to Havre de Grace, MD.

Also see, The_Aegis_and_Intelligencer_Fri__Jul_30__1875, page where it states Mr Dechant finished a complete map of the canal to Havre de Grace in 1875.

Residents of the rival port city of Philadelphia, fearing loss of trade to Baltimore, argued against the proposal.

Since this was only 20 miles (32 km) further by water than from Havre de Grace to Baltimore, the Susquehanna and Tidewater Canal stood to benefit both cities.

[1] Despite toll collections rising from $42,000 in its first year to about four times that amount by 1850, the canal company faced money problems.

After 1855, toll revenue fell; flood damage, railroad competition, and the disruptions of the Civil War hastened the decline.

It cut across the northern isthmus of the Delmarva Peninsula and made a lower Susquehanna canal more appealing to Philadelphia.

[7] Remnants of the canal can be seen at Susquehanna State Park in Harford County, Maryland, 3 miles (4.8 km) northwest of Havre de Grace as part of the Southern Terminal, Susquehanna and Tidewater Canal historic district listed on the National Register of Historic Places.

[8][9][10] The Susquehanna Museum in Havre de Grace has restored the lock house and other infrastructure at the southern terminus of the canal.