23 CA ADC § 128


      23 CCR s 128

      Cal. Admin. Code tit. 23, s 128


      CALIFORNIA CODE OF REGULATIONS
      TITLE 23. WATERS
      DIVISION 1. RECLAMATION BOARD
      CHAPTER 1. ORGANIZATION, POWERS AND STANDARDS
      ARTICLE 8. STANDARDS
      This database is current through 05/19/06, Register 2006, No. 20.

      s 128. Bridges.

      (a) The standards for construction or modification of bridges within an 
      adopted plan of flood control are as follows:

      (1) Any excavation within the levee section or near bridge supports within 
      the floodway must be backfilled in four- (4) inch to six- (6) inch layers 
      with approved material. The levee section must be compacted to a relative 
      compaction of not less than ninety (90) percent per ASTM D1557-91, dated 
      1991, which is incorporated by reference and above optimum moisture 
      content. Compaction within the floodway must be to the density of the 
      adjacent undisturbed material.

      (2) Compaction tests by a certified soils laboratory may be required to 
      verify compaction.

      (3) Bridge piers and bents within the floodway must be constructed 
      parallel to the direction of streamflow.

      (4) Bridge piers and bents placed within a floodway to support a widened 
      portion of an existing bridge must be constructed in line with existing 
      bents and piers.

      (5) Erosion control may be required on the channel banks or levee slopes 
      upstream and downstream of a proposed bridge.

      (6) Drainage from a bridge or highway may not be discharged onto a levee 
      section or streambank.

      (7) Plans showing all construction facilities (such as temporary staging, 
      coffer dams, and falsework) which will remain in a floodway during flood 
      season, must be submitted to the board for approval prior to installation 
      of these facilities.

      (8) All construction facilities (such as temporary staging, coffer dams, 
      and falsework) must be designed to prevent bank erosion during normal 
      flows and to maintain maximum channel capacity during the flood season.

      (9) Stockpiled material, temporary buildings, construction equipment, and 
      detours that obstruct streamflows must be removed from floodways prior to 
      the flood season.

      (10)(A) The bottom members (soffit) of a proposed bridge must be at least 
      three (3) feet above the design flood plane. The required clearance may be 
      reduced to two (2) feet on minor streams at sites where significant 
      amounts of stream debris are unlikely.

      (B) When an existing bridge being widened does not meet the clearance 
      requirement above the design flood plane, the bottom structural members of 
      the added section may be no lower than the bottom structural members of 
      the existing bridge, except as may be caused by the extension of existing 
      sloped structural members.

      (C) When the clearance requirement above design flood plane would result 
      in bridge approach ramp fill in the floodway, the clearance requirement 
      may be reduced to the extent that reasonably balances clearance and fill 
      that would obstruct flow, so as to maintain maximum channel capacity.

      (11)(A) Vehicular access from the roadway to the levee crown may be 
      required at each end of a bridge.

      (B) Vehicular access from the levee crown to the floodway and/or the 
      landside levee toe beneath the bridge may be required. Ramps may slope 
      upstream as necessary to provide the access required by this subdivision.

      (12) Approved gates must be installed at right angles across the levee 
      crown at all points of access to the levee from each end of a bridge.

      (13) Any bridge abandoned or being dismantled must be completely removed, 
      and must be disposed of outside the limits of the levee section and 
      floodway.

      (14) Pilings, piers, bents, and abutments of bridges being dismantled must 
      be removed to at least one (1) foot below the natural ground line and at 
      least three (3) feet below the bottom of the low water channel.

      (15) Any bridge that is damaged to the extent that it may impair the 
      channel or floodway capacity must be repaired or removed prior to the next 
      flood season.

      (16) Replacement railroad bridges must have the soffit members no lower 
      than those of the replaced bridge, but are not required to have a 
      specified amount of clearance above the design flood plane.

      (17) Bridge replacements and new bridges shall be built at an elevation so 
      that there is no depression in the crown of the levee.

      (b) The standards for maintenance of bridges within an adopted plan of 
      flood control are as follows:

      (1) The area in and around a bridge site must be kept clear to maintain 
      the design flow capacity.

      (2) Trees, brush, sediment, and other debris must be kept cleared from the 
      bridge site and be disposed of outside the limits of the floodway prior to 
      the flood season.

      (3) Any accumulation of debris during high flows must be immediately 
      removed from a bridge site and disposed of outside the floodway.


      


      Note: Authority cited: Section 8571, Water Code. Reference: Sections 8608, 
      8609 and 8710, Water Code. 


       HISTORY 
         
      1. New section filed 9-30-96; operative 10-30-96 (Register 96, No. 40).
      23 CA ADC s 128

      END OF DOCUMENT

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