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Printed on:Wednesday 08/28/2024 12:09 PM 29C0488/AAAA/139161Pageof3 Department of Transportation - Division of Maintenance Structure Maintenance & Investigations 6 UNDERWATER INVESTIGATION DETAILS - NOT APPLICABLE FOR THIS BRIDGE. STEEL INVESTIGATION DETAILS SCOPE AND ACCESS This report addresses hydraulic issues only and documents findings of a field review carried out on 8/9/2024 by Structure Maintenance & Investigations (SM&I) - Local Agency Hydraulics Branch. The field investigation was initiated by the Area Bridge Maintenance Engineer (ABME) who requested a scour review based on the bridge being new to the inventory with a National Bridge Inventory (NBI) Item 113 Code of 6 (bridge not yet evaluated for scour). The channel water depth was approximately 2.5 feet deep and required waders to access. The water within the channel was turbid and lighting was minimal. The only National Bridge Inventory (NBI) Item reviewed was the Item 113 Code (Scour Critical Bridges). All other NBI codes and elements ratings were carried over from the 4/25/2024 Routine Inspection Report. ORIENTATION The report follows (SM&I) convention and orients the bridge south to north. The south abutment is designated as Abutment 1. HISTORY As-builts are on file in Caltrans archives. The only previous routine inspection was carried out on 4/25/2024. The previous report does not mention any scour issues. REVISIONS The National Bridge Inventory Item 113, "Scour Critical Bridges" has been changed from 6 to 5: "Bridge foundations determined to be stable for assessed or calculated scour condition. Scour is determined to be within the limits of the footings or piles by assessment, by calculations, or by installation of properly designed countermeasures". WATERWAY A channel cross section was taken and was compared to the previous cross section. There are no significant changes SUBSTRUCTURE Probing was conducted along the face of both abutments and within the center of the channel. Probing concluded that there is minimal cover at the footings at both abutments. The abutments were not exposed, but the remaining cover could not be determined due to poor visibility. The probe was used within the channel and was able to penetrate up to 10 inches from the top of the footing before hitting solid material. This solid material was noted throughout the entire channel. It is likely that the material is concrete, but findings are inconclusive due to the low visibility and turbid water. SCOUR CONSIDERATIONS There is no footings exposed and the probing concluded that there is dense material within the channel. There are no previous scour issues and none were present at time of this inspection. INSPECTION COMMENTARY - NOT APPLICABLE FOR THIS BRIDGE. CONDITION INFORMATION SPECIAL INSPECTION INFORMATION