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Printed on:Wednesday 04/30/2025 02:28 PM 29C0051/AAAQ/151728Pageof3 <br />Department of Transportation - Division of Maintenance Structure Maintenance & Investigations <br />7 <br />UNDERWATER INVESTIGATION DETAILS - NOT APPLICABLE FOR THIS BRIDGE. <br />STEEL INVESTIGATION DETAILS <br />SCOPE AND ACCESS <br />All elements were accessible by foot on and around the structure. There was 3 feet of slow flowing water in the slough below Spans 3 <br />through 5 during this investigation. Piers 4 was submerged near the waterline and inspected through clear water with the aid of waders <br />and probing. All visible elements were fully inspected. A complete routine inspection was performed. <br />SUBSTRUCTURE <br />Non-engineered RSP was placed on the slope between Piers 2 and 3 before the 2023 routine inspection. (See Photos 2 and 3 dated <br />02/09/2023). According to the Bridge Scour Plan of Action dated 07/17/2021 the placement of non-engineering RSP is a temporary scour <br />countermeasure to mitigate the scour below Spans 1 to 3. This condition has been previously reported and no significant changes were <br />noted. <br />There is a support bracket attached between Columns 4 and 5 at Pier 5. In addition, there is a full width horizontal crack in Column 5 <br />below the placement of the bracket. It appears the crack has been previously patched. See Photos 3 and 4. <br />There are two erosion gullies up to 3 feet wide x 12 inches deep x full embankment height below Spans 8 an 9 on the right. This <br />condition appears to be caused by roadway run-off. See Photo 5 dated 02/09/2023. <br />WATERWAY <br />The NBI Item #113 is a 3, "Scour Critical." A Bridge Scour Evaluation - Plan of Action dated 07/17/2021 is on file in BIRIS. The plan calls <br />for monitoring of the structure by San Joaquin County annually and during high flows. <br />The channel cross section was checked during this inspection and there was no significant change in the elevations when compared to <br />the channel cross section taken on 02/09/2023. <br />INSPECTION COMMENTARY <br />- NOT APPLICABLE FOR THIS BRIDGE. <br />CONDITION INFORMATION <br />SPECIAL INSPECTION INFORMATION