Title 11 . Natural Resources

Chapter 95 . (No Regulations Filed)

Section 265. Classification of surface water bodies

11 AAC 95.265. Classification of surface water bodies

(a) Classification of surface water bodies by an operator or by an agency must be made according to the following criteria:

(1) on private land in Region I, classification of surface waters into Types I-A, I-B, I-C, or I-D must be made in accordance with AS 41.17.950 (27) - (30) using the procedures established in this section; any surface waters that do not meet the criteria set out in AS 41.17.950 (27) - (30) do not have a riparian area, but are subject to surface water quality protection best management practices in accordance with this chapter;

(2) on private land in Region II, classification of surface waters must indicate whether or not the surface waters are anadromous or contain high value resident fish under AS 41.17.950 ;

(3) on private land in Region III, classification of surface waters into Type III-A, III-B, or III-C must be made in accordance with AS 41.17.950 (31) - (33); any surface waters that do not meet the criteria set out in AS 41.17.950 (31) - (33) do not have a riparian area, but are subject to surface water quality protection best management practices in accordance with this chapter;

(4) on other public land and on state land managed by the department in Regions I and II, classification of surface waters must indicate whether or not the surface waters are anadromous or contain high value resident fish under AS 41.17.950 .

(5) on other public land and on state land managed by the department in Region III, classification of surface waters into Type III-A, III-B, or III-C must be made in accordance with AS 41.17.950 (31) - (33).

(b) A stream may have more than one water body classification along its length and may also have a different water body classification on opposite banks, depending on streambank characteristics.

(c) An operator's classification of a water body type may be verified by the agencies before or during the review of a detailed plan of operations, and is subject to a field inspection under AS 41.17.090 (f). Except as provided in AS 41.17.090 (e), the division will change the water body classification made by an operator if the division determines that a water body was incorrectly classified. For private land in Region I, the division will base its decision on evidence or lack of evidence of anadromous fish at or upstream of the area proposed for reclassification using procedures in (g) of this section and the criteria set out in AS 41.17.950 (27) - (30). In Region III, the division will base its decision on the criteria set out in AS 41.17.950 (31) - (33) and the evidence or lack of evidence of anadromous fish or high value resident fish at or upstream of the area proposed for reclassification.

(d) An operator or the division may request the deputy commissioner to conduct a field review to document the presence or absence of anadromous fish, and in Region III, the presence or absence of high value resident fish. The recommended practice is to schedule a field review at a time when the presence of anadromous fish or evidence of anadromous fish are likely to be present and the site is accessible. This subsection provides an optional procedure for an operator and does not extend the time schedule for field inspections under AS 41.17.090 (f).

(e) A water body that was incorrectly classified at the time of submission of the detailed plan of operations, and that has standing timber remaining in the riparian area at the time of subsequent reclassification under (c) of this section, is, with respect to any remaining standing timber, subject to the appropriate riparian standard under AS 41.17.116 - 41.17.119, and this section.

(f) Except for an estuarine area at the mouth of an anadromous fish stream, salt water bodies are not subject to AS 41.17.115 - 41.17.119.

(g) The following provisions and Table A of this subsection apply to classification of an anadromous fish stream on private land in Region I:

(1) beginning at the mouth of an anadromous fish stream and proceeding upstream, a stream in which all the required elements of a Type I-A stream as defined in AS 41.17.950 (27) predominate remains a Type I-A stream up to the point of physical blockage, or where any required element of a Type I-A stream ceases to predominate for the remainder of the stream, whichever occurs first; at that point, the stream becomes a Type I-B, I-C, or I-D stream as the case may be;

(2) a Type I-B stream may become, in an upstream segment, a Type I-A stream if the required elements of a Type I-A stream are present in that upstream segment;

(3) a stream may not be classified a Type I-A or I-B upstream from the point of physical blockage;

(4) an operator may presume that a physical blockage occurs at any point or stream reach that meets one or more of the criteria in Table A: Anadromous Fish Blockage; however, the agencies and operators may not consider a physical blockage to occur if evidence or presence of anadromous fish is found above that point or reach of the stream, in which case it would be reclassified using the procedures and standards in this section;

(5) to determine fall height under (4) of this subsection, measure the additive height of multiple falls only if resting pools do not occur between them; otherwise, the falls are separate features; measurements are made from the jump pool surface to the water surface above the fall, both at ordinary high water;

(6) notwithstanding (4) of this subsection, in stream reaches that provide rearing habitat for juvenile anadromous fish, but not spawning habitat for adult anadromous fish, an operator may presume a blockage if any individual falls is greater than three feet; measured as described in (5) of this subsection;

(7) a beaver dam is not presumed to constitute a blockage.

TABLE A:

Anadromous Fish Blockage

Criterion Coho Steelhead Sockeye Chinook Pink/Chum Maximum fall height. A blockage may be presumed if fall height in feet exceeds: 11 13 10 11 a) 4 with deep jump pool b) 3 without pool Pool depth. 1.25 X jump height, except that no minimum pool depth exists for falls, as follows: A blockage may be pre- a) less than 4 in the case of coho and steelhead; sumed if b) less than 2 in the case of other anadromous fish species. the unobstructed water column depth in feet within the pool is less than: Steep channel. A 9 percent blockage gradient may be pre- sumed at the upper end of the reach if channel steepness in feet is equal to or greater than the following without resting places for fish:

History: Eff. 6/10/93, Register 126; am 11/20/99, Register 152; am 6/24/2004, Register 170

Authority: AS 41.17.010

AS 41.17.055

AS 41.17.080

AS 41.17.115

AS 41.17.116

AS 41.17.118

AS 41.17.119

AS 41.17.950