East Prussia '14 update 1.02 now available!

[burroughs]

Indeed there is a bridge on the map.

However, Georgij K. Korolkov in his monography on the Lodz operation states that Gen. Rennekampf asked the Northwestern Front prior to the breakout of hostilities to build a bridge at Plock and to form a battle group on the left river bank that would lift V Siberian Corps isolation in Wloclawek. The Front failed to act on either suggestion and on Oct 29th Gen. Rennenkampf on his own ininitiative ordered VI Siberian Corps to cross at Plock using the measures "available on the spot", but there were none and it took asking the Modlin fortress commander to provide crossing equipment.  As a result a pontoon / floating bridge was constructed on Oct 30th-31st with the use of barges and steam powered ferries.

Hence apparently there wasn't any bridge at Plock at the time. Moreover, Korolkov writes that there weren't even any harbors, marinas or bulk berths to speed the building of the pontoon bridge.