{"action":"create","ckan_id":null,"date_created":"Mon, 23 Feb 2026 10:56:36 GMT","date_finished":null,"harvest_job_id":"ea815ff5-316b-4473-8727-9cd17a789376","harvest_source_id":"45128e59-6202-4d80-b562-79a78ffe01f0","id":"31a2e67f-67c9-4c80-a43d-32d2f00ae27d","identifier":"https://www.arcgis.com/home/item.html?id=0921c900c32a4c5a81c672c98d68ed47&sublayer=0","parent_identifier":null,"source_hash":"bd2203d55bb6bf6673ee19a52010877e35f0ea16ba120a0b1c604d0c6f1ad4a4","source_raw":"{\"@type\": \"dcat:Dataset\", \"accessLevel\": \"public\", \"contactPoint\": {\"@type\": \"vcard:Contact\", \"fn\": \"for_admin\", \"hasEmail\": \"mailto:dnr.gispub@alaska.gov\"}, \"description\": \"The culverts in this dataset are required to meet the BMP's under the Alaska Forest Resources and Practices Act. Each culvert was reviewed on-site. Nearly all culverts and the streams they span were surveyed for bed width, pool depth, length diameter, gradient and blockage. Each pipe was given a 1 to 4 (best) rating based on its ability to pass fish. In addition, fish traps were set at all crossings where stream classification was unknown. Surveys were carried out by DNR-DOF and ADFG-Habitat.
Terms and descriptions can be found in the following Division of Forestry publication:\\u00a0Implementing\\nBest Management Practices\\nfor Timber Harvest\\nOperations.
ROAD DRAINAGE
11 AAC 95.295(b) - 1. NUMBER OF DRAINAGE STRUCTURES
APPLICABILITY
\\u2022 Construction of drainage systems on forest roads.
OBJECTIVES
\\u2022 To avoid exceeding the capacity of the ditch. Runoff flowing down the ditchline must be relieved before it can overwhelm the capacity of the ditch, flooding the road.
\\u2022 To prevent erosion of adjacent cut slopes or roadbed material. As flows increase, so does their capability to cause erosion, especially on steeper grades.
\\u2022 To keep roads constructed on unstable soils well drained.
\\u2022 To control discharge of sediment-laden runoff from a road. Runoff collected by the road drainage system needs to be spread out across the hillside to
\\u2022 avoid erosion that would be caused by a more concentrated flow, and
\\u2022 allow vegetation to filter out suspended sediment.
REQUIREMENTS
\\u2022 Install and space drainage structures as necessary to accommodate peak flows or to assure adequate drainage of unstable soils. Inadequate drainage of a road saturates the soil and decreases stability.
\\u2022 Prevent degradation of surface water quality. Sediment-laden runoff from a road needs to be spread out across the hillside so sediment can be filtered out by vegetation.
Implementing BMPs for Timber Harvest Operations 51
NOTES
\\u2022 Less frequent spacing of drainage structures is permissible if the parent material of roadbed is not erodible, such as rock or gravel, or the topography is not conducive to erosion. More frequent spacing is required where soil is unstable or where peak flows require more drainage structures to prevent degradation of surface water quality.
\\u2022 To determine whether accumulated flows are eroding cut banks or roadbed material adjoining the ditchline, look for undercutting and slumping of cut banks and widening of the ditchline where sections of the roadbed have been washed away.
\\u2022 To determine whether the ditch capacity is being exceeded, look for places where the ditchline flows have escaped the ditch and flowed down or across the road (scouring of roadbed material).
\\u2022 Ditchline flows need to be reduced where the grade increases, and where soils are highly erodible.
\\u2022 Wetter hillsides require more drainage structures to handle anticipated flows.
\\u2022 If subsurface flow dominates on a well-drained hillside, roads will usually not intercept subsurface flows, requiring fewer drainage structures.
\\u2022 Discharges near surface waters should be minimized, potentially requiring additional relief structures to reduce the drainage area.
\\u2022 Fewer drainage structures may be needed where the terrain prevents runoff from reaching surface waters.
\\u2022 Sediment entering surface waters indicates a need for more drainage structures.
\\u2022 Consider current weather conditions during inspection. Drainage needs will be more obvious on wet days. On dry days, anticipate the needs during extreme weather conditions based on terrain and road material.
\\n | \\ufeffRating\\u00a0 | \\n Does the road segment have enough drainage\\n structures to adequately handle peak flows?\\u00a0 | \\n Amount of erosion of roadbed, cutslopes,\\n and fills:\\u00a0 | \\n
\\n \\n | 1 | \\n No\\u00a0 | \\n Significant\\u00a0 | \\n
\\n \\n | 2 | \\n No\\u00a0 | \\n Throughout the road segment\\u00a0 | \\n
\\n \\n | 3 | \\n Portions of the road do not\\u00a0 | \\n On some portions of the segment\\u00a0 | \\n
\\n \\n | 4 | \\n Yes, on most of the road segment\\u00a0 | \\n In a few places\\u00a0 | \\n
\\n \\n | 5 | \\n Yes\\u00a0 | \\n None\\u00a0 | \\n
\\n \\n | N/A\\u00a0 | \\n No drainage structures were required along the road segment\\n evaluated.\\u00a0 | \\n \\u00a0 | \\n
11 AAC 95.295(b) \\u2013 2. DRAINAGE STRUCTURES ON NATURAL DRAINAGES
APPLICABILITY
\\u2022 Construction of drainage systems on forest roads.
OBJECTIVES
\\u2022 To prevent road construction from blocking any natural drainage.
\\u2022 To prevent a road from washing out.
Implementing BMPs for Timber Harvest Operations 52
REQUIREMENTS
\\u2022 Install drainage structures on all natural drainages.
NOTES
\\u2022 Drainage structures must be capable of handling peak flows (estimate by width and depth of channel at high water mark).
\\u2022 Consider flow restrictions through culverts when determining if they are adequate to handle anticipated flows.
\\u2022 A structure in poor condition will not function to its full capacity and will need to be replaced.
\\n | \\ufeffRating\\u00a0 | \\n Number of natural drainages lacking\\n adequate drainage structures:\\u00a0 | \\n Drainages flowed across the road? | \\n
\\n \\n | 1 | \\n Majority\\u00a0 | \\n Yes\\u00a0 | \\n
\\n \\n | 2 | \\n Many\\u00a0 | \\n Drainages with inadequate relief\\u00a0 | \\n
\\n \\n | 3 | \\n A few\\u00a0 | \\n In places\\u00a0 | \\n
\\n \\n | 4 | \\n Occasional\\u00a0 | \\n Some drainage structures have been exceeded\\u00a0 | \\n
\\n \\n | 5 | \\n None\\u00a0 | \\n No\\u00a0 | \\n
\\n \\n | N/A\\u00a0 | \\n There are no natural drainages along the road segment being\\n evaluated.\\u00a0 | \\n \\u00a0 | \\n
11 AAC 95.295(d). OUTSLOPING AND DITCHING ROADS
APPLICABILITY
\\u2022 Forest roads utilizing through-cuts or partial/full bench road construction.
OBJECTIVES
\\u2022 Provide drainage structures to collect and carry runoff away from a road. Design road so drainage structures intercept and carry runoff from the hillside and inside portions of a crowned road surface.
\\u2022 To help drain the roadbed. Design road so runoff will flow off the surface.
REQUIREMENTS
\\u2022 Roads must be outsloped, or ditched on the uphill side.
NOTES
\\u2022 When a road is confined by a hillside, runoff from the road and ephemeral drainages from the hillside must be collected. Short sections of road that cut through a ridge may not require a ditch if the road can be graded or banked so runoff will drain off the road within a short distance.
\\u2022 If a ditch is needed on the uphill side of a road, it should be constructed as an integral part of the road, collecting runoff from the hillside and road surface. It should be close enough to the road so a grader can pull and clean it.
\\u2022 Straight sections of road should visually slope to the outside edge of the road. Winding sections should be distinctly banked to direct runoff towards the inside corner of the curve and off the road.
\\u2022 Erosional patterns should show that runoff is rapidly seeking the outer edge and does not flow for an extended distance down the road.
\\n | \\ufeffRating\\u00a0 | \\n Road segment ditched or outsloped?\\u00a0 | \\n Ditch adequate to handle normal flows along\\n road segment?\\u00a0 | \\n \\n \\n | 1 | \\n No\\u00a0 | \\n N/A\\u00a0 | \\n \\n \\n | 2 | \\n Only partially\\u00a0 | \\n No\\u00a0 | \\n \\n \\n | 3 | \\n Partially\\u00a0 | \\n Yes, normal flows\\u00a0 | \\n \\n \\n | 4 | \\n Along most of road segment\\u00a0 | \\n Yes, peak flows on most of road segment\\u00a0 | \\n \\n \\n | 5 | \\n Yes\\u00a0 | \\n Yes, peak flows\\u00a0 | \\n \\n \\n | N/A\\u00a0 | \\n No ditching or outsloping along the road segment is required.\\u00a0 | \\n \\u00a0 | \\n
| | | |
\\n | \\ufeffRating\\u00a0 | \\n On portions of the road segment where no\\n ditch is installed, effectiveness of outsloping the road in directing runoff\\n to and off the edgeof the road:\\u00a0 | \\n
\\n \\n | 1 | \\n N/A\\u00a0 | \\n
\\n \\n | 2 | \\n Only marginally effective\\u00a0 | \\n
\\n \\n | 3 | \\n Somewhat effective\\u00a0 | \\n
\\n \\n | 4 | \\n Not entirely effective\\u00a0 | \\n
\\n \\n | 5 | \\n Effective\\u00a0 | \\n
\\n \\n | N/A\\u00a0 | \\n | \\n
11 AAC 95.295(f). DIVERT DITCHLINE RUNOFF AWAY FROM SURFACE WATERS
APPLICABILITY
\\u2022 Applies to ditches along all forest roads.
\\u2022 Applies to unstable soils and surface waters.
OBJECTIVES
\\u2022 To provide ditchline relief prior to the road crossing a surface water.
\\u2022 To avoid directing the discharge from a ditch onto unstable soils.
REQUIREMENTS
\\u2022 To the extent feasible, direct ditchline runoff away from unstable soils and surface waters, and onto vegetative areas.
NOTES
\\u2022 Discharges should be directed away from stream channels, intermittent stream channels, and unstable soils.
\\u2022 A drainage structure should be provided as close as practical to the stream crossing to relieve the ditchline before flows reach the crossing site.
\\u2022 Drainage relief should be provided where outflows can percolate into the soil, or drainage should be directed through sufficient vegetation to remove suspended sediment before reaching surface waters.
\\u2022 Low spots in the terrain or intervening ridges can be used to intercept discharges from the drainage relief structure, allowing suspended sediment to filter or settle out before reaching adjacent surface waters.
\\ufeff
\\n | \\ufeffRating\\u00a0 | \\n When feasible, were drainage features\\n designed or installed to divert ditchline flows away from surface waters or\\n unstable soils along the roadsegment?\\u00a0 | \\n
\\n \\n | 1 | \\n No\\u00a0 | \\n
\\n \\n | 2 | \\n Yes, along a portion of the segment, but were not very effective.\\u00a0 | \\n
\\n \\n | 3 | \\n Yes, along most of the segment, and were somewhat effective.\\u00a0 | \\n
\\n \\n | 4 | \\n Yes, generally effective\\u00a0 | \\n
\\n \\n | 5 | \\n Yes,\\u00a0 | \\n
\\n \\n | N/A\\u00a0 | \\n The road segment crossed no surface waters or unstable soils.\\u00a0 | \\n
11 AAC 95.295(i). DO NOT DISCHARGE ONTO ERODIBLE OR FILL SLOPES
APPLICABILITY
\\u2022 Applies to discharges from cross drains, culverts or diversion ditches.
OBJECTIVES
\\u2022 To prevent erosion and sediment generation.
REQUIREMENTS
\\u2022 Outfalls may not discharge onto erodible soils or fill slopes without adequate outfall protection.
NOTES
\\u2022 If outfalls are discharging onto erodible soils or fill slopes, ensure adequate protection is provided to prevent erosion of the soil or failure of the fill slope.
\\n | \\ufeffRating\\u00a0 | \\n Were protective measures taken to prevent\\n erosion of erodible soils and fill slopes along a portion of the road\\n segment?\\u00a0 | \\n Adequacy of measures toprotect against\\n erosion:\\u00a0 | \\n
\\n \\n | 1 | \\n No.\\u00a0 | \\n N/A\\u00a0 | \\n
\\n \\n | 2 | \\n Along a portion of the road segment.\\u00a0 | \\n Occasionally adequate\\u00a0 | \\n
\\n \\n | 3 | \\n Along much of the road segment\\u00a0 | \\n Somewhat adequate\\u00a0 | \\n
\\n \\n | 4 | \\n Along the whole road segment\\u00a0 | \\n Usually adequate\\u00a0 | \\n
\\n \\n | 5 | \\n Always adequate\\u00a0 | \\n \\u00a0 | \\n
\\n \\n | N/A\\u00a0 | \\n No drainage structures discharged onto erodible soils or fill slopes\\n along the road segment evaluated.\\u00a0 | \\n \\u00a0 | \\n
The Alaska Division of Forestry & Fire Protection does not guarantee the accuracy of the data. This dataset is an approximation and for display purposes only. Every reasonable effort has been made to ensure that data is current and accurate. The representations depicted and information retrieved are only as accurate as the source, which may be from other agencies and organizations.
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source; State of Alaska, Department of Natural Resources, Division of Forestry & Fire Protection. If the user has modified the data in any way, the user is obligated to describe the types of modifications that the user has made. The user specifically agrees to not misrepresent these datasets, nor to imply that the changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Forestry & Fire Protection.
The State of Alaska makes no express or implied warranties with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise.
Questions regarding the data can be directed to the Division of Forestry & Fire Protection GIS Unit dof.gis@alaska.gov .
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