cuadrasen
-they tallied
The word cuadrasen is the imperfect subjunctive form of cuadrar in the third person plural.
See the full cuadrar conjugation

cuadrar

Localizamos el embalse antes mencionado, y empezamos a detenernos en cada lugar que la carretera cruza el río, descartando todos los puentes que no cuadrasen.
We go to the dam that we talked about, we start just literally going through every time that road crosses the river, crossing off the bridges that don't match.
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