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Department of Transportation - Division of Maintenance <br />Structure Maintenance & Investigations <br />INSPECTION COMMENTARY <br />SCOPE AND ACCESS <br />Mokelumne River (Miller's Ferry) County Bridge <br />Directions: East of Walnut Grove on Thorton-Walnut Grove Blvd (38.223493,-121.506986) <br />EQUIPMENT INFORMATION <br />Incoming Main Voltage: 240V, 3-phase AC <br />PG&E #2633482 <br />Drive Motor: 230V, 7.5 HP, 22A (NEC) <br />End Jack Motor (east and west) <br />3 HP, 1750 RPM <br />230 V, 8.6 A <br />Center Wedge Motor <br />1 HP, 1730 RPM <br />230 V, 8.OA <br />Motors feeder main voltage measured before operation : 248 V <br />Insulation Resistance Readings measured before operation: <br />Drive Motor 250+ MOhms <br />Center Wedge Motor 1.2 MOhms (See work recommendation) <br />West End Lift Motor 250+ MOhms (See work recommmend ation) <br />East End Lift Motor 170 MOhms <br />Current readings measured during operation: <br />Drive Motor 2 sec inrush of 140 amps <br />running 12.0-16.0 amps <br />Center Wedge Motor 3.5 amps (pull), 3.2 amps (drive) <br />West End Lift Motor 6.0 amps(raise), 7.5 amps(lower) <br />East End Lift Motor 6.5 amps(raise), 6.0 amps(lower) <br />PERSONNELPRESENT <br />Ernie Espinoza, Bridge Operator <br />Mike Shelton, Bridge Maintenance <br />County Contact: <br />Jeffery Verstl jverstl@sjgov.org (209) 953-7600 <br />Bridge Engineering Division <br />Davin Parker Maintenance Manager dparker@sjgov.org (209) 468-3074 <br />Public Works Department <br />San Joaquin County <br />(209) 953-7600 <br />STEEL INVESTIGATION DETAILS <br />This structure qualifies for an in-depth Steel investigation because it possesses the following non -redundant steel tension members <br />(NSTM) or fatigue prone details <br />Floor Beams: NSTM, <br />Truss: NSTM with Category E Welds <br />NSTMI Required Yes Last NSTMI 01/29/2025 <br />UNDERWATER INVESTIGATION DETAILS <br />UWI Required Y Last UWI 08/31/2020 <br />Dive Type B - Routine UW <br />NSTMI Fred. 24 months Next NSTM Inspection 01/29/2027 <br />UWI Frequency 60 months Next UWI 08/31/2025 <br />Water Type 3 - Brackish <br />Printed on: Monday 06/23/2025 03:35 PM Page 3 of 8 29C0131/AABI/153160 <br />