Attachment_2A_-_2019_LCYA0230_UWRpt.pdf

Los Algodones Bridge Inspection Report

Bridge elevation looking downstream (2019).

Structure Information

Inspection Type: Underwater Maintained By: Imperial Irrigation District State Route 186 OVER All-American Canal

Boulder Canyon Project Lower Colorado Region Yuma Area Office

NBI #: 0304-0098 RBI #: LCYA0230

Date of Inspection: 12/29/2019 Date of Last Inspection: 12/6/2017

Bridge Name: Los Algodones Bridge Inspection Date: 12/29/2019 NBI #: 0304-0098 Yuma Area Office

Inspection Information Inspection Members: Dustin Johnson, Caireen Ulepic, Corey Dickson, Jeff Lynn, and Jim Burke Attendees: Angel Gutierrez, John Reid Time of Inspection: 7:00 A.M. Temperature: 40 - 60°F Weather Description: Sunny, calm Legal Description and Coordinates Aliquot Part:

SW1/4

Section:

Township:

16S

Range:

21E

Meridian:

San Bernardino

Latitude: 32.7378 Longitude -114.7174

Bridge Description

The bridge carries State Route 186 over the All-American Canal and provides sole access to the Andrade/Los Algodones Border Crossing which has over 1.6 million crossings annually. The bridge is part of a check structure which features seven radial gates controlled from a platform on the west (downstream) side of the bridge deck. The check structure regulates flows on the All-American Canal and delivers water to Mexico.

The bridge is a seven-span, concrete slab bridge. The three concrete slabs are each 18 inches thick and are supported intermittently by concrete piers. Each of the five center spans are 20 feet long and the end spans are 19.5 feet each for a total structure length of 140 feet. The bridge deck has a curb-to-curb width of 24 feet and an edge-to-edge width, including the gate control deck, of 32.2 feet. Concrete curbs, 18 inches wide by 9 inches tall, run along both sides of the roadway. The bridge deck has a thin asphalt concrete wearing surface.

The channel is concrete lined at the structure and earth lined upstream and downstream.

The bridge is oriented in the north-south direction and the canal flows from east to west. For the purpose of this inspection, the bridge is documented right to left looking downstream.

Report Approval Team Leader: Dustin Johnson, P.E. Reviewer: Kevin Tibbs, P.E.

X Team Leader

Reviewer

Approver: Richard Eastland, P.E.

Approver

Critical Findings Was a Critical Finding identified during this inspection? No If yes, describe the Critical Finding:

NA

Critical Finding Plan of Action

If a Critical Finding was identified, what is the required Plan of Action to correct the issue?

NA

Structural Evaluation Summary

The inspection was coordinated with the Imperial Irrigation District (IID), Yuma Area Office (YAO) and the Lower Colorado Region (LC) Dive Team. The inspection was scheduled during a system wide flow reduction requested by CalTrans for the purpose of inspecting CalTrans owned bridges in the Calexico area 45 miles downstream.

The underwater portions of the abutments, wingwalls and pier were in good condition. Only minor abrasion and aquatic buildup was observed on the concrete surfaces. Several irregular shaped repair patches were observed on the channel lining. Most of the patches were located near the expansion joint immediately upstream of the bridge piers. Several of these patches were showing signs of delamination. The joint compound at the expansion joints had substantially deteriorated. A 1-inch vertical offset was observed at the expansion joint immediately upstream of the bridge. Overall the concrete channel protection was still in stable condition and repairs to the failing concrete patches are not necessary at this time.

Recommendations and Estimated Costs Definitions Category 1 Recommendations involving the correction of severe deficiencies where immediate responsive action is required to ensure structural safety and operational integrity of a facility.

Category 2 Recommendations covering a wide range of important matters where action is needed to prevent or reduce further damage or preclude possible operational failure of a facility.

Category 3 Recommendations covering less important matters but believed to be sound and beneficial suggestions to improve, or enhance, the O&M of a project or facility.

Status of Previous Incomplete O&M Recommendations Number Description Cost Scheduled

Completion Status

2018-2-D Coordinate a date and time for a reduction in flows to 500 cfs or less in the All-American Canal at the Pilot Knob Check Structure and complete a dive inspection of the upstream portion of the structure.

- 2020 Complete

2019-2-A Plan and schedule for a new crossing to carry State Route 186 over the All-American Canal

$20,000,000 2027 Incomplete

2019-2-B Install Test Level 1 bridge railing or other mitigation measures to prevent vehicles from crashing through handrails and entering canal.

$20,000,000 2027 Incomplete

2019-3-A Repair spalled concrete lining on right canal bank upstream and downstream of bridge structure.

Incomplete

2019-3-B Repair conduit on downstream curb. Incomplete New or Modified O&M Recommendations None

Notes to Future Inspectors

Dive Plan

The underwater features inspected include the left and right abutment walls and wingwalls, six intermediate pier walls and the concrete apron. Two dives, using surface supplied air, were required to complete the inspection. A representative from IID was onsite to close and lockout six of the seven downstream radial gates.

Only the gate adjacent to the abutment opposite of the diver was open. The first diver entered the canal from the left bank upstream of the wasteway turnout, proceeded along the left wingwall and concluded at the left side of Pier 2. The second diver entered the canal from the right bank upstream of the bridge structure, proceeded along the right wingwall and concluded at the right side of Pier 2.

Field Inspection Report Condition Rating Codes for Items 58-62 N Not Applicable 3 Serious Condition – loss of section, deterioration, spalling, or scour have seriously affected primary structural components.

Local failures are possible. Fatigue cracks in steel or shear cracks in concrete may be present

9 Excellent Condition 8 Very Good Condition – no problems noted.

7 Good Condition – some minor problems.

2 Critical Condition – advanced deterioration of primary structural elements. Fatigue cracks in steel or shear cracks in concrete may be present or scour may have removed substructure support. Unless closely monitored it may be necessary to close the bridge until corrective action is taken.

6 Satisfactory Condition – structural elements show some minor deterioration.

5 Fair Condition – all primary structural elements are sound, but may have minor section loss, cracking, spalling, or scour

1 “Imminent” Failure Condition – major deterioration or section loss present in critical structural components or obvious vertical or horizontal movement affecting structure stability.

Bridge is closed to traffic, but corrective action may return structure to light service.

4 Poor Condition – advanced section loss, deterioration, spalling, or scour

0 Failed Condition – out of service; beyond corrective action.

Condition Rating Code Equivalents for Sub-Components G = Good (7-9) F = Fair (5-6) P = Poor (0-4) N = Not Applicable UNK = Unknown 60 Substructure Condition 7 - Good Abutments Notes (with Sub-Component Number):

60.1 – Minor abrasion (<1/8”) and minor aquatic accumulation. 1. Breastwalls or Columns G

2. Piles N

3. Caps and/or Bearing Seats UNK

4. Backwalls and/or Bulkheads N

5. Foundations G

6. Wingwalls G

7. Weep Holes N

8. Expansion Joints G

9. Erosion and/or Scour G

10. Settlement or Deflection G

11. Slope Protection G

12. Other Piers Notes (with Sub-Component Number):

60.13 – Minor abrasion (<1/8”) and minor aquatic accumulation. 13. Walls and/or Columns G

14. Piles N

15. Caps and/or Bearing Seats UNK

16. Foundations G

17. Erosion and/or Scour G

18. Settlement or Deflection G

19. Other

61 Channel and Channel Protection Condition 7 - Good

1. Alignment G Notes (with Sub-Component Number):

Rating driven by above water elements documented in routine inspection.

61.3 – Multiple irregularly shaped repair patches predominately located near the expansion joint immediately upstream of bridge piers. Several patches are delaminated. 1” vertical displacement at expansion joint immediately upstream of bridge piers. Failed expansion joint filler material.

61.4 – Minor silt and debris with no significant obstructions to flow.

2. Erosion and/or scour G

3. Channel Protection F

4. Waterway Obstructions G

5. Adequacy of Opening G

6. Streambed Composition G

7. Other

Scour Critical Bridges Every bridge should have a scour evaluation report on-file that documents the code for Item 113 – Scour Critical Bridges. Every routine inspection should verify that the Item 113 code is still valid.

Item Current

Rating Valid?

(Yes/No)

Notes

113 – Scour Critical Bridges

6 No Scour screening pending.

Waterway Adequacy See Coding Guide for a description of each rating code Item Rating Notes 71 – Waterway Adequacy 9 Highly regulated canal minimally impacted by flooding.

Structure Inventory & Appraisal (1 of 2)

Structure Inventory & Appraisal (2 of 2)

Photographs

Photo 1: Typical concrete surface, left abutment.

Photo 2: Expansion joint looking towards Pier 1.

Photo 3: 1-inch vertical offset at expansion joint.

Photo 4: Irregular concrete patch at Span 6.

Photo 5: Isolated debris at Span 7.