Amendment 0002 Page 22-OVERLAPPING TIMBER STEP.pdf
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- Solicitation number
- 1240LU26Q0096
- Issued by
-
Department of Agriculture Forest Service
About this file
This is a technical drawing specification for an overlapping timber step installation at Ashley Lake North Campground in the Flathead National Forest, Tally Lake Ranger District, prepared by the USDA Forest Service Northern Region.
The drawing details three step configurations (OTS-1, OTS-2, OTS-3) with varying overall lengths (28 feet, 23 feet, and 19 feet respectively) and widths (16.5 inches and 24 inches). All steps feature 8-inch by 8-inch minimum sawn timber or log diameter construction for carriages, risers, and sills made from Douglas Fir with UC4B waterborne preservative treatment for ground contact/heavy duty applications. The bottom steps of each configuration utilize recycled plastic structural lumber in brown color, with OTS-1 incorporating approximately 18 steps (bottom 3 plastic), OTS-2 approximately 14 steps (bottom 2 plastic), and OTS-3 approximately 8 steps (bottom 1 plastic). Step runs measure 12 inches minimum with 6-inch typical embedment at 1/3 minimum. Construction specifications include pre-drilled holes for rebar and pins, number 5 rebar minimum with 18-inch spacing, backfill with suitable material, and field treatment of all drilled holes and cuts. The drawing was designed by C. Steen, checked by CL3, and dated 05/20/2026, with revision information noted as sheet 22 of 40.
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Text version
OVERLAPPING TIMBER STEP
NO. 5
REBAR
MINIMUM
MINIMUM
18 INCHES
(TYP)
PLAN VIEW
ELEVATION VIEW
OVERALL LENGTH
OVERALL
WIDTH
STEP RUN
12 INCH
MINIMUM
CL
CL
6 INCH
(TYP)
EMBED 1/3
MINIMUM (TYP)
CARRIAGE
8 X 8 MINIMUM
SAWN TIMBER
OR 8 INCH MINIMUM
LOG DIA.
SLOPE %2
BACKFILL WITH
SUITABLE MATERIAL SILL
8 X 8 MINIMUM
SAWN TIMBER
OR 8 INCH MINIMUM
LOG DIA.
RISER
8 X 8 MINIMUM
SAWN TIMBER
OR 8 INCH MINIMUM
LOG DIA.
NOTES:
PRE-DRILL HOLES FOR REBAR AND PINS TO PREVENT SPLITTING OF LOGS OR
SAWN TIMBERS.
RECESS END OF REBAR 1/2 INCH BELOW TOP OF TIMBER.
COMPACT BACKFILL IN 6 INCH LIFTS UNTIL NO VISUAL DISPLACEMENT.
ALL FIELD DRILLED HOLES AND CUTS SHALL BE FIELD TREATED.
REMOVE AND DISPOSE OF DUFF AND TOP ORGANIC LAYERS DOWN TO MINERAL
SOIL.
MINIMUM OVERLAP OF BOTTOM CARRIAGE IS THE SAME AS THE STEP RUN
LENGTH.
RISERS AND CARRIAGES SHALL BE THE SAME DIMENSIONS.
PLASTIC LUMBER SHALL BE EQUAL TO OR BETTER THAN PLASTIC LUMBER YARD
STRUCTURAL GRADE 8" x 8" RECYCLED PLASTIC LUMBER COLOR BROWN.
AVAILABLE FROM PLASTIC LUMBER YARD., NORRISTOWN PA, 19401;
PHONE: 610-590-9201
1.
2.
3.
4.
5.
6.
7.
8.
PRESERVATIVE TREATMENT - (REFER TO AWPA USE CATEGORY SYSTEM)
48"
COMMENTS
ROUGHLY 18 STEPS - BOTTOM 3 STEPS PLASTIC LUMBER
WIDTH
OVERALL
16.5"
RUN
STEP
TYPE
MATERIAL
SAWN TIMBER / PLASTIC LUMBEROTS-1
STEP
28'
LENGTH
OVERALL
MATERIAL
GROUND CONTACT / HEAVY DUTY
SIZE
8" x 8" DOUGLAS FIR
GRADE
SPECIES/
TYPE
UC4B
TYPE
PRESERV.
SAWN TIMBER
WATERBORNE TREATMENT
48" ROUGHLY 14 STEPS - BOTTOM 2 STEPS PLASTIC LUMBER16.5"OTS-2 23'
48" ROUGHLY 8 STEPS - BOTTOM 1 STEPS PLASTIC LUMBER24"OTS-3 19'
STRUCTURAL / HEAVY DUTY / COLOR BROWN8" x 8" RECYCLED PLASTICPLASTIC LUMBER
SAWN TIMBER / PLASTIC LUMBER
SAWN TIMBER / PLASTIC LUMBER
DWG SHEET NO.
OF
SHEET
9/2 8/1
8 0 7:
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CHECKEDDESIGNERDATEDRAWING TITLE
United States Department of Agriculture Forest Service
NO. DATEBYREVISION DESCRIPTION
TALLY LAKE RANGER DISTRICT
FLATHEAD NATIONAL FOREST
ASHLEY LAKE NORTH CAMPGROUND
RENOVATION
NORTHERN REGION
REGION 1 OVERLAPPING
TIMBER STEP
05/20/2026 CL3 C. STEEN 22
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