The Soviet Shimorskoye ship repair yard according to a CIA report dated September 1967

An item reported the fenced and road served Soviet Shimorskoye ship repair yard with as geographic coordinates 55.19.00 north and 42.00.30 east located 15 nautical miles south of Murom, Shimorskoye along the Oka used for repairing river craft. The shipyard possessed a side-haul marine railway with minimal 1  transverse slipway, 1 quay and 13 support buildings.

Source
The report was published on www.archive.org, document number CIA-RDP78T04759A007300010035-9