C05 Attachment 14 031001L010201-Encino Lookout-20250513-SAR-LO-Data V1.1.pdf
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- Solicitation number
- 127EAX26Q0069
- Issued by
-
Department of Agriculture Forest Service
About this file
This is a USFS Tower Structural Analysis Form used for documenting and inspecting communication tower structures on U.S. Forest Service lands. The form provides a comprehensive framework for collecting and recording structural data on existing towers to support engineering analysis and maintenance planning.
The document captures detailed information across multiple dimensions: tower identification (location, type, height, material); foundation data including vertical load testing results for each leg (ranging from 3,250 to 5,200 PSI for the example Encino Lookout tower); mounted equipment inventory with precise elevation, offset, and dimensional specifications; stairway, platform, and railing configurations; and inner bracing details organized by section. The form includes a 59'6" tall, square cross-section, galvanized steel self-support tower with extensive antenna and solar panel equipment mounted at various elevations. Structural components are documented with member sizes, bolt specifications, and bracing types (X-brace, diamond configurations). The inspection yielded a passing P&T (Proof Test) result and was completed on 5/13/2025 by Inspector Tanner Burnett under Engineer Mohanad Ashor. The document serves as a standardized data collection instrument containing instructional diagrams, equipment photo references, antenna type examples, and bracing type illustrations to ensure consistent and thorough tower assessments across USFS regions.
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USFS TOWER STRUCTURAL ANALYSIS FORM 1
USFS TOWER STRUCTURAL ANALYSIS FORM
Tower Information
Region/Forest: 03/10 Tower Type: Self-Support Inspector Name: Tanner Burnett Site Name: Encino Lookout System Type: Lookout Inspection Date: 5/13/2025
Site ID: 031001L010201 Tower Material: Galv. Steel Last Inspection: Unknown Latitude: 36°7'21.17"N Tower Height: 59’6” Engineer Name: Mohanad Ashor
Longitude: 106°33'12.75"W Cross Section: Square P&T Results: Pass
Inspection Team Notes Tower structure data on attached work document.
Foundation Information
Tower Leg: Testing Test Data Foundation Dimensions Leg A Vertical 3,650 PSI 16”x16” Leg B Vertical 4,250 PSI 16”x16” Leg C Vertical 5,200 PSI 16”x16” Leg D Vertical 3,250 PSI 16”x16” Leg AA N/A N/A N/A Leg BB N/A N/A N/A Leg CC N/A N/A N/A Leg DD N/A N/A N/A
Guy Wire System Information Tower Leg: Guy Strand Guy Size Tension Test Data (lbfs.) (Input Bottom to Top) Leg A:
N/A N/A N/A
Leg B:
N/A N/A N/A
Leg C:
N/A N/A N/A
Leg D:
N/A N/A N/A
(Include: Distance from middle of tower to anchor, guy pull off elevation, mounting style and size) Tower Leg: Guy System Bottom Configuration Guy System Top Configuration Leg A:
Anchor Rod Thickness N/A Elevation N/A Pull off Style N/A Distance (Anchor Rod to Tower Center)
N/A Azimuth Degrees° N/A Hardware Size N/A Pull off Dimensions N/A
Leg B:
to Tower Center)
N/A Azimuth Degrees° N/A Hardware Size N/A
Leg C:
to Tower Center)
N/A Azimuth Degrees° N/A Hardware Size N/A
Leg D:
to Tower Center)
N/A Azimuth Degrees° N/A Hardware Size N/A
USFS TOWER STRUCTURAL ANALYSIS FORM 2
Mounted Equipment and Structures Inventory Mount Information Equipment Information
Location Elevation Mount Structure Dimensions (Include Material Thickness)
Horizontal Offset
Vertical Offset
Mounted Equipment Type & Dimensions (Include ladder & transmission lines)
Face D 57” Direct Mount N/A N/A ¾” Conduit Leg D 71“ Direct Mount N/A N/A 1” Conduit Leg D 76” Direct Mount N/A N/A 1” Flexduit Face B 6’11” 2xHP 74”x2”x2” 74” N/A 3x43”x19”, 1x38.5”x19” Solar Panels Face B 20’2” 2xHP 74”x2”x2” 74” N/A 6x56”x25”Solar Panel Face B 31’9” 2xHP 74”x2”x2” 74” N/A Solar Panel
Leg D 42’7”
VP 5’x4.5”OD, 0.23” thick, VP 52”x2.5”OD, 0.12” thick, VP
71”x2.5”OD, 0.12” thick, 2xHP 7.75”x2.3”OD, 0.12” thick
20” 26” 2’ Dish
Leg C 45’ VP 69”x2.3”OD, 0.15” thick 13” 55” 10’ x1.9”OD Dual Dipole Antenna
Face D 55’11” HP120”x1.5”OD, 0.13” thick, VP 72”x1.3”OD, 0.2” thick 32” N/A Unused mount
Face B 52’8” C-channel, 2.5”x1”, 0.13” thick 14” N/A 3x20”x23.5” Solar Panels Leg B 48’6” VP 69”x2.3”OD, 0.15” thick 13” 55” 10’x1.9”OD Dual Dipole Antenna Select Select Select Select Select Select Select Select Select Select Select Select Example Example Example Example Example Leg A 10’ 2 - L2”x2” H, 1 - P3” V 24” 18” 5’x3”, Omnidirectional Leg B 20’ Direct Mount 0” 0” 15’x1.5”, Bay Folded Dipole (4) Face B 5’ to 20’ Direct Mount 0” 0” 1”, Transmission line (1) Select Key: V=Vertical, H=Horizontal, D=Diagonal, L=Angle, P=Pipe/Tube, S=Solid, OD=Outside Diameter, SS = Single Splice, DS = Double Shear
Notes:
- Elevation is from foundation to base of mount.
- Number of members, position of member, and member size excluding length.
- Vertical Offset: Measure distance from base of mount up to base of equipment.
- Equipment Type & dimensions Length x Diameter.
- Horizontal Offset: Measure distance from tower leg or face to equipment.
Stairway and Platform Addendum
Type Number of Steps
Number of Stairways, Platforms, or Catwalks
Step, Platform,or Catwalk Size Handrail Size
Stairway 16 6 24”x9”x1.5” 1.5”x1.5”x0.16”THICK Platform 5 N/A 47”x47”x47” 1.5”x1.5”x0.16”THICK Select Select
Inner Bracing Addendum Shape Diamond Size 2.9”x2.9”, 0.2” thick Section 1 Shape Diamond Size 3”x3”, 0.2” thick Section 2 Shape Diamond Size 2.4”x2.4”, 0.13” thick Section 3 Shape Diamond Size 1.9”x1.9”, 0.13”thick Section 4
USFS TOWER STRUCTURAL ANALYSIS FORM 3
Equipment (Photos)
Antenna Types Fiberglass
Omnidirectional Folded Dipole Bay Folded Dipole
(2 or more) Yagi Antenna Dish Antenna Whip Antenna Bowtie Antenna
Icom Antenna Dipole Loop Antenna Grid Antenna Sector Antenna Log Periodic
Bracing Types
Z Brace X Brace
CX (no stitch plate)
K Brace Right K Brace Up K1 Brace Tapered Top Tapered Base
Double K Diamond K Brace Left K Brace Down M Brace Top Plate Bottom Plate
Key
V=Vertical D=Diagonal P=Pipe/Tube OD=Outside Diameter #=Number of pieces H=Horizontal L=Angle S=Solid WxD = Width x Depth SS=Single Splice DS=Double Shear
USFS TOWER STRUCTURAL ANALYSIS FORM 4
Leg size Bolt Size & # H Size Bolt Size & #
Diagonal Size Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & #
BRH Height TRH Height VR Height
Leg size Bolt Size & # H Size Bolt Size & #
Diagonal Size Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & #
BRH Height TRH Height VR Height
Leg size Bolt Size & # H Size Bolt Size & #
Diagonal Size Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & #
BRH Height TRH Height VR Height
Leg size Bolt Size & # H Size Bolt Size & #
Diagonal Size Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & #
BRH Height TRH Height VR Height
Leg size Bolt Size & # H Size Bolt Size & #
Diagonal Size Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & # Redundant Bolt Size & #
BRH Height TRH Height VR Height
Leg size L4”x4”, 0.34”thick
Bolt Size & # N/A
H Size Bolt Size & # Diagonal Size L2.5”x2.5”, Bolt Size & # 9x0.75”
Redundant L2.5”x2.5”, 0.2” thick
Bolt Size & # 5x0.75”bolts
Redundant N/A Bolt Size & # N/A Redundant N/A Bolt Size & # N/A Redundant N/A Bolt Size & # N/A
BRH Height 6” TRH Height N/A VR Height N/A
TG Size Bolt Size & # Brace Type Select Panel Height & # Section Height Face Width
TG Offset BG Offset Gusset size Bolt Size & #
BG Size Bolt Size & # VR Size Bolt Size & #
Notes:
TG Size Bolt Size & # Brace Type Select Panel Height & # Section Height Face Width
TG Offset BG Offset Gusset size Bolt Size & #
BG Size Bolt Size & # VR Size Bolt Size & #
Notes:
TG Size Bolt Size & # Brace Type Select Panel Height & # Section Height Face Width
TG Offset BG Offset Gusset size Bolt Size & #
BG Size Bolt Size & # VR Size Bolt Size & #
Notes:
TG Size Bolt Size & # Brace Type Select Panel Height & # Section Height Face Width
TG Offset BG Offset Gusset size Bolt Size & #
BG Size Bolt Size & # VR Size Bolt Size & #
Notes:
TG Size Bolt Size & # Brace Type X Brace Panel Height & # Section Height Face Width
TG Offset BG Offset Gusset size Bolt Size & #
BG Size Bolt Size & # VR Size Bolt Size & #
Notes:
TG Size 3”x3”, 0.2” thick
Bolt Size & # 4x0.75”
Brace Type X Brace Panel Height & # 156.5” Section Height 14’10” Face Width 190”
TG Offset 15” BG Offset N/A Gusset size 10”x7.5”, 0.2” thick Bolt Size & # 6x0.75”
BG Size N/A Bolt Size & # N/A VR Size N/A Bolt Size & # N/A
Notes:
• TRH: TOP REDUNDANT HORIZONTAL •VR: VERTICAL REDUNDANT • BG: BOTTOM GIRT
• BRH: BOTTOM REDUNDANT HORIZONTAL • H: HORIZONTAL • TG: TOP GIRT
USFS TOWER STRUCTURAL ANALYSIS FORM 5
Structural Analysis Data Collection Example
USFS TOWER STRUCTURAL ANALYSIS FORM 6
CAB Width 1 x Height 84”x CAB Width 2 x Height 84”
Platform Width 1 x Height N/A Platform Width 2 x Height N/A
Support Column under platform Size
L3”x3”x0.2” thick # of Columns 2
Support Beam under platform Size
N/A # of Beams #
Type of floor Wood Floor Dimension 7’x7’
PLATFORM PERIMETER DIMENSIONS
AND OUTER FRAME COMPOSITION:
N/A
USFS TOWER STRUCTURAL ANALYSIS FORM 7
1 ROOF PERIMETER DIMENSIONS AND
COMPOSITION:
8’x8’ thin steel
NUMBER OF WINDOWS SIDE A: 18 DIMENSIONS OF WINDOWS SIDE A: 12.25”x12.75”, 0.1” thick
NUMBER OF WINDOWS SIDE B: 18 DIMENSIONS OF WINDOWS SIDE B: 12.25”x12.75”, 0.1” thick
NUMBER OF WINDOWS SIDE C: 18 DIMENSIONS OF WINDOWS SIDE C: 12.25”x12.75”, 0.1” thick
NUMBER OF WINDOWS SIDE D: 18 DIMENSIONS OF WINDOWS SIDE D: 12.25”x12.75”, 0.1” thick
3 NUMBER OF DOORS: 1 DIMENSIONS OF DOOR (LxWxT) Hatch: 30”x33”, 1.4” thick wood
4 NUMBER OF PANELS AND COMPOSITION 1 per side DIMENSIONS OF PANELS (LxWxT) 7’x47”
RAILING NUMBER OF VERTICAL # SIZE OF VERTICAL and HEIGHT N/A
RAILING NUMBER OF HORIZONTAL # SIZE OF HORIZONTAL and HEIGHT N/A
6 NUMBER OF MAIN COLUMN 4 SIZE OF MAIN COLUMN and HEIGHT L3”x3”. 0.2” thick
7 NUMBER OF MAIN BEAM 1 SIZE OF MAIN BEAM and HEIGHT L3”x3”, 0.2” thick
8 NUMBER OF SECONDARY COLUMN 5 SIZE OF SEC. COLUMN and HEIGHT 0.9”, 2”
9 NUMBER OF SECONDARY BEAM 2 SIZE OF SEC. BEAM and HEIGHT 0.9”
USFS TOWER STRUCTURAL ANALYSIS FORM 8
Structural Analysis Work Instruction:
Guy System Configuration Bottom:
o Distance(s) from center of tower to the top of anchor rod.
o Anchor rod size.
Guy System Configuration Top:
o Guy pull-off elevation(s) from foundation to the base of the pull-off.
o Guy pull-off type. Standard types are flat bars, angles, double angles, channels, solid rounds, and pipe.
o Guy pull-off size. Material width and depth or thickness. Take a picture.
Guy System Data Collection Example:
Tower Leg: Guy System Bottom Configuration Guy System Top Configuration
Leg A:
Anchor Rod Thickness S1.25” Elevation 48’ 3” Pull off Style Flat
Distance (Anchor Rod to Tower Center)
105’ 6” Azimuth Degrees° 0 degrees Hardware Size 1x5/8”
Pull off Dimensions 2”x0.375”
Structural analysis data collection:
o Face width is to be collected at the bottom of each section and at the top of the overall structure (not to include mast sections).
o If the top section of the tower converges to a single point extending above the tower it should be identified as a “mast” with dimensions provide in the face width row.
o Leg thickness should be collected on each leg of the tower at each section and entered as an average for each section.
o Towers with members designed to be climbed like a ladder should not be considered a mounted ladder.
o Tower panels are to be identified by each diagonal or set of diagonals. Example in a Z brace configuration presenting 7 diagonals in a section the tower has 7 panels in that section.
o (#xbolt) is asking the number of bolts and bolt size at a single connection point. Example a tower flange has 4 bolts, and each bolt is
5/8” in size (4x5/8”).
o If a tower horizontal is between gusset plates the length measurement is required.
o Tower section greater than 50ft shall be divided in 2 sections with the sections being separated at the top of the most centrally located horizontal brace.
Partial braces are to be regarded as a “Step”. Measure top of brace to top of brace.
Structural Analysis Data Collection Example:
Equipment Inventory and Data Collection:
o Measure the elevation mounted to the first mounting point on the tower.
o Offset from the tower structure should be measured from outside of member attachment point to outside of equipment mount.
o Transmission line size, number, and spacing between lines (if applicable) should be identified separate from a mounted feed line ladder.
o Dimensional data for equipment should be entered (length x width x depth), with extension pipes like on dipoles measured as well
(diameter x length).
Structural Analysis Data 1 Brace Type X Brace Mounted Ladder Select
Section Height 20’ Face Width 72” Panel Height 60” Panel #’s 4
Leg Size & Thickness P2.5”, 0.135” Top Girt 4” Bottom Girt 6” Flange or Base or Splice Size 8”x8”x0.5” Bolt Size & Count 4x0.75” Horizontal (Size & Thickness) L1.5”x1.5”, 0.25” Bolt Size & Count Per Brace 2x0.5” Diagonal (Size & Thickness) L1.5”x1.5”, 0.25” Bolt Size & Count Per Brace 3x0.5” Gusset (Size & Thickness) 4”x8”x0.375” Bolt Size & Count Per Gusset 2x0.5”
USFS TOWER STRUCTURAL ANALYSIS FORM 9
Mounted Equipment Data Collection Example:
Mounted Equipment and Structures Inventory
Mount Information Equipment Information Location Elevation Mount Structure Dimensions
(Include Material Thickness) Horizontal
Offset Vertical Offset
Mounted Equipment Type & Dimensions (Include ladder & transmission lines)
Leg A 10’ 2 - L2”x2” H, 1 - P3” V 24” 18” 5’x3”, Omnidirectional Leg B 20’ Direct Mount 0” 0” 15’x1.5”, Bay Folded Dipole (4) Face B 5’ to 20’ Direct Mount 0” 0” 1”, Transmission line (1)
Stairways and Platforms Example:
Stairway and Platform Addendum Type Number of Steps Number of Stairways, Platforms, or Catwalks
Step, Platform,or Catwalk Size Handrail Size
Stairway 20 6 24”x8”x0.5” L2”x2”, 0.25” Platform N/A 5 36”x48”x0.375” L2”x2”, 0.25”
Inner Brace Example:
Inner Bracing Addendum Shape Diamond Size L2”x1.5”, 0.25” Section 2
Instructional Diagrams:
USFS TOWER STRUCTURAL ANALYSIS FORM 10
USFS TOWER STRUCTURAL ANALYSIS FORM 11
USFS TOWER STRUCTURAL ANALYSIS FORM 12
USFS TOWER STRUCTURAL ANALYSIS FORM 13
Guy Wire Azimuth Degrees:
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