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<br />Drainage structures and related items shall be cleared of all foreign material which <br />has been deposited above the flow line and all vegetative growth which interferes <br />with the flow pattern. Grass shall be left in place provided drainage is not obstructed. <br />All roadside ditches, lead-off ditches, and culvert inlet and outlet ditches shall be <br />cleaned in such a manner so that reasonable conformance to previous line, grade, and <br />cross section will be achieved. Ditches that are free of debris larger than 3 inches in <br />diameter and 1 foot in length and which provide drainage will not require cleaning. <br />Rolling dips shall be maintained to a depth and width adequate to drain the roadway. <br />The lower end of the rolling dips, including lead-off ditches shall be shaped to drain <br />water from the roadway. <br />Culverts which have silted in to a depth of 1/4 of their opening height or more shall <br />have their inlets and outlets cleaned as well as 3 feet of the upper and lower ends of <br />the inside cleaned out to expose the full diameter of the culvert. <br />Plugged culverts shall be cleaned, or replaced if directed by the Forest Service. <br />Catch basins shall be cleazed of material to the bottom of the invert of the culvert and <br />at least two feet horizontally towards the backslope, or the width of the basin, <br />whichever is greater, in order to provide for the unobstructed flow of water. <br />Any loose material on the backslope adjacent to the entrance of culverts shall be <br />removed. Material removed, if suitable, may be blended into existing native road <br />surfaces or shoulders. On aggregate surfaced roads care must be taken to assure the <br />material is not mixed into the existing aggregate. Unsuitable material shall be <br />deposited in locations as to assure it will not obstruct the normal flow pattern. <br />4. Removal of Obstructions <br />a. Down trees, rocks, and stumps that have fallen into the roadway and any other <br />eminent hazards shall be removed. <br />Trees that have fallen within the roadway shall be limbed, cut into manageable <br />lengths and placed outside the roadway limits. <br />Hazard trees and snags designated for removal shall be felled outside the roadway <br />and limbed. Trees shall be cut within 12 inches of the natural ground. All stumps <br />and logs shall be positioned so they will not roll. <br />Slash shall be scattered outside the roadway and drainage way. Rocks and stumps <br />designated for removal shall be positioned away from the roadway in such a manner <br />as to assure they will not roll onto the roadbed nor obstruct drainage. Resulting holes <br />shall be backfilled with native material and mounded to drain. <br />3 <br />