Idaho Administrative Code
Title IDAPA 20 - Lands, Department of
Rule 20.02.01 - RULES PERTAINING TO THE IDAHO FOREST PRACTICES ACT
Section 20.02.01.070 - SLASHING MANAGEMENT
Current through August 31, 2023
01. Purpose. To provide for slashing and fire hazard management resulting from harvesting, forest management, forest tree species improvement, or defoliation caused by chemical applications necessary to protect reproduction and residual stands, reduce risk from fire, insects and disease or optimize the conditions for future forest tree species regeneration and to maintain air and water quality, fish and wildlife-habitat. (3-31-22)
02. Commercial Slash. Fuels and debris resulting from a forest practice involving removal of a commercial product must be managed as set forth in the Idaho Forestry Act, Title 38, Chapters 1 and 4, Idaho Code and the rules and regulations pertaining to forest fire protection. (3-31-22)
03. Non-Commercial Slash. Fuels and debris resulting from a forest practice where no commercial product is removed must be managed in a manner as hereinafter designated under authority of the Idaho Forest Practices Act, Title 38, Chapter 13, Idaho Code. (3-31-22)
TABLE I - HAZARD POINTS |
|||||||||||
Hazard Points for Ponderosa Pine, Western Red Cedar or Western Hemlock |
|||||||||||
Thinned Stems Per Acre |
|||||||||||
Ave. DBH |
250 |
500 |
750 |
1000 |
1250 |
1500 |
1750 |
2000 |
2500 |
3000 |
4000 |
1 |
1 |
2 |
3 |
3 |
4 |
5 |
6 |
7 |
9 |
10 |
16 |
2 |
3 |
6 |
9 |
13 |
16 |
22 |
25 |
30 |
36 |
42 |
51 |
3 |
7 |
16 |
25 |
32 |
38 |
46 |
51 |
52 |
56 |
59 | |
4 |
9 |
22 |
32 |
40 |
50 |
52 |
54 |
56 |
60 | ||
5 |
13 |
28 |
40 |
51 |
54 |
56 |
59 |
60 | |||
6 |
19 |
36 |
51 |
54 |
58 |
60 |
60 | ||||
Hazard Points for Douglas Fir, Grand Fir or Engelmann Spruce |
|||||||||||
Thinned Stems Per Acre |
|||||||||||
Ave. DBH |
250 |
500 |
750 |
1000 |
1250 |
1500 |
1750 |
2000 |
2500 |
3000 |
4000 |
1 |
1 |
2 |
3 |
4 |
6 |
7 |
8 |
9 |
13 |
16 |
22 |
2 |
4 |
7 |
13 |
16 |
22 |
28 |
32 |
36 |
42 |
50 |
54 |
3 |
8 |
19 |
28 |
36 |
44 |
51 |
53 |
54 |
58 |
60 | |
4 |
10 |
25 |
36 |
46 |
51 |
54 |
57 |
59 |
60 | ||
5 |
16 |
32 |
46 |
52 |
56 |
59 |
60 |
60 | |||
6 |
22 |
40 |
52 |
56 |
60 |
60 |
60 | ||||
Hazard Points for Western Larch, Lodgepole Pine or Western White Pine |
|||||||||||
Thinned Stems Per Acre |
|||||||||||
Ave. DBH |
250 |
500 |
750 |
1000 |
1250 |
1500 |
1750 |
2000 |
2500 |
3000 |
4000 |
1 |
1 |
2 |
2 |
3 |
4 |
4 |
5 |
6 |
8 |
9 |
13 |
2 |
3 |
6 |
8 |
11 |
16 |
19 |
22 |
28 |
32 |
38 |
48 |
3 |
6 |
16 |
25 |
32 |
38 |
46 |
51 |
52 |
56 |
59 | |
4 |
8 |
16 |
28 |
36 |
44 |
50 |
52 |
54 |
58 | ||
5 |
9 |
22 |
32 |
42 |
50 |
53 |
55 |
57 | |||
6 |
13 |
28 |
40 |
50 |
53 |
56 |
59 |
TABLE II - HAZARD POINTS WORKSHEET
HAZARD CHARACTERISTICS |
HAZARD POINTS |
||
Fuel Quantity |
|||
Hazard points from Slash Hazard Table I 1/ |
_____________________ |
||
Record number of trees/acre to be cut |
_____________________ |
||
Average D.B.H. |
_____________________ |
||
Predominant species |
_____________________ |
||
_____________________ |
|||
Size of thinning block |
|||
Points 0 - 15 |
16 - 30 |
31 - 45 |
46 - 60 1/ |
Acres 20 |
20 - 40 |
40 - 80 |
80 |
ASPECT |
PERCENT SLOPE |
|||
0 - 19 |
20 - 39 |
40 - 59 |
60 |
|
E or NE |
0 |
5 |
10 |
20 |
E or NW |
0 |
5 |
10 |
30 |
W or SE |
0 |
10 |
30 |
40 |
S or SW |
0 |
20 |
40 |
60 |
1/ |
Max. 60 points |
Other Factors |
|
Condition of operating area before forest practice commences |
0 - 20 points |
Condition of adjoining area |
0 - 20 points |
Presence of snags and culls |
0 - 5 points |
Deterioration rate of slash |
0 - 5 points |
Time of year forest practice operation |
10 points |
October thru December |
2 points |
August thru September |
4 points |
January thru April |
7 points |
May thru July |
10 points |
TOTAL FOREST PRACTICE AREA POINTS |
(Max. 240 points) |
TABLE III - HAZARD OFFSETS
Offsets |
Hazard Point Deductions |
Physical Changes to the Hazard (1) |
|
(1) Points will be proportional to the amount of hazard disposed of or modified. |
|
Disposal by burning or removal. |
0 - 160 |
Modification by reducing depth through crushing, chipping or lopping. |
0 - 60 |
On Site Improvements |
|
Condition of main access road to forest practice area should allow movement of heavy trucks without difficulty. |
0 - 5 |
Access control to forest practice area provided by closure to public traffic. |
0 - 5 |
Availability of water for tankers within one mile of forest practice area or within three miles for helicopter bucket use. Water supply to be sufficient to supply at least fifty thousand (50,000) gallons. |
0 - 15 |
Buffer zones of unthinned areas at least two chains in width between roadways and thinned areas. |
0 - 10 |
Fuel breaks with slash hazard removal around and/or through forest practice area, located so as to provide optimum fire control effect and of two to four chains in width. |
0 - 25 |
Fire trails with fuel removed to expose mineral soil to a width of twelve (12) feet. Maximum points allowed if combined with a fuel break. |
0 - 15 |
Extra Protection | |
Increased attack capability such as retardant availability, increased attack manpower and equipment. Must be in addition to regular forces normally available during the fire season. |
0 - 40 |
Fire detection and prevention increased beyond that normally available for lands in the fire protection district. |
0 - 15 |
Initial attack time based on proximity of forest practice area to initial attack forces. |
0 - 5 |
Landowner protection plan which would provide extra fire protection on a voluntary basis such as extra equipment and/or manpower. |
0 - 5 |
(3-31-22)