021306000001024_Oct_2025 - Critical Finding Report - West Fork.pdf

STRUCTURE NUMBER- 021306000001024 TEAM LEADER- Jason Hefter

INSPECTION DATE- 10/27/2025 STRUCTURE CONDITION- F - Fair

CRITICAL FINDING INSPECTION REPORT

Structure Name W FORK OF SAN

JUAN RIVER

Route Number 648

Structure Mile Point 2.50

Admin Org 021306

State 8 - Colorado

County 79

Latitude 37.44988333333333

Longitude -106.91113611111112

Inspection Team Lead

Inspection Reviewer

Jason Hefter, 10/27/2025

Jason Hefter, 10/27/2025

© OpenStreetMap contributors

Location: 13.7 MI NNE OF PAGOSA SPG

37.44988, -106.91114

MAP PAGE

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER Route Number: 648, Mile Point: 2.50

Structure Number: #021306000001024 / Critical Finding

IDENTIFICATION

(1) State Names 8 - Colorado

(8) Structure Number 021306000001024

(5) Inventory Route 1

(2) Highway Agency District

(3) County Code

(4) Place Code 0

(6) Features Intersected W FORK OF SAN JUAN RIVER

(7) Facility Carried FDR 648

(9) Location 13.7 MI NNE OF PAGOSA SPG

(11) Mile Point 2.485484 mi

(12) Base Highway Network No

(13) LRS Inventory Rte & Subrte

(16) Latitude 37.44988333333333

(17) Longitude -106.91113611111112

(98) Border Bridge State Code

(99) Border Bridge Structure No.

(43) Main Structure Type 32 Material 3 - Steel

Type 2 - Stringer/Multi-beam or girder

(44) Approach Structure Type 00

Material 0 - Other Type 0 - Other

(45) No. of Spans in Main Unit 1

(46) No. of Approach Spans 0

(107) Deck Structure Type 1 - Concrete Cast-in-Place

(108) Wearing Surface/Protective System

Type of Wearing Surface 1 - Monolithic Concrete (concurrently pl Type of Membrane 0 - None

STRUCTURE TYPE AND MATERIAL

0 - NoneType of Deck Protection

AGE AND SERVICE

(27) Year Built 1954

(106) Year Reconstructed 0

(42) Type of Service 15

On 1 - Highway Under 5 - Waterway

(28) Lane On 1

Under 0

(29) Average Daily Traffic 32

(30) Year of ADT 2002

(109) Truck ADT %

(19) Bypass, Detour Length 98.176618 mi

CLASSIFICATION

(112) NBIS Bridge Length Y

(104) Highway System 0

(26) Functional Class 9 - Rural Local

(100) Defense Highway 0 - The inventory route is not

(101) Parallel Structure N - No parallel structure exis

(102) Direction of Traffic 3 - One lane bridge for 2 - way traffic

(103) Temporary Structure

(105) Federal Lands Highways 0 - N/A

(110) Designated National Network 0 - The inventory route is not

(20) Toll 3 - On free road. The structu

(21) Maintain 64 - U.S. Forest Service

(22) Owner 64 - U.S. Forest Service

(37) Historical Significance 4 - Historical significance is

GEOMETRIC DATA

(48) Length of Maximum Span 49.540684 ft

(49) Structure Length 53.149608 ft

(50) Curb or Sidewalk Width

Left 0.9842519999999999 ft Right 0.9842519999999999 ft

(51) Bridge Roadway Width Curb to Curb 14.107612 ft

(52) Deck Width Out to Out 16.076116000000003 ft

(32) Approach Roadway Width (W/Shoulders) 15.091864 ft

(33) Bridge Median 0 - No median

(34) Skew 0 Deg

(35) Structure Flared 0 - No flare

(10) Inventory Route Min Vert Clear 99.99 ft

(47) Inventory Route Total Horiz Clear 14.107612 ft

(53) Min Vert Clear Over Bridge Rdwy 99.99 ft

(54) Min Vert Underclear 0 ft Ref:

(55) Min Lat Underclear RT

0 ft

0 ft Ref:

(56) Min Lat Underclear LT

NAVIGATION DATA

(40) Navigation Horizontal Clearance 0 ft(116) Vert-Lift Bridge Nav Min Vert Clear 0 ft(39) Navigation Vertical Clearance

(111) Pier Protection 0 - No navigation control on w(38) Navigation Control

0 ft

LOAD RATING AND POSTING

(31) Design Load 2 - M 13.5 / H 15

(63) Operating Rating Method 8

(64) Operating Rating

Type 8 - Load and Resistance Factor Rating (LRF Rating 0.8

(65) Inventory Rating Method 8 - Load and Resistance Factor

(66) Inventory Rating

Type Rating 0.62

(70) Bridge Posting

(41) Structure Open/Posted/Closed A - Open, no restriction

5 - Equal to or above legal loads

APPRAISAL

(67) Structural Evaluation 6

(68) Deck Geometry 6

(69) Clearances, Vertical/Horizontal N

(71) Waterway Adequacy 7

(72) Approach Roadway Alignment 3 (36A) Bridge Railings (36B) Transitions 1 - Inspected feature meets current (36C) Approach Guardrail 1 - Inspected feature meets current (36D) Approach Guardrail Ends

(113) Scour Critical Bridges 5 - Bridge foundations determined t

1 - Inspected feature meets current

1 - Inspected feature meets current

PROPOSED IMPROVEMENTS

(75) Type of Work

(76) Length of Structure Improvement 74.803152 ft

(94) Bridge Improvement Cost (Multiply value by 1000) $ 128

(95) Roadway Improvement Cost (Multiply value by 1000) $ 13

(96) Total Project Cost (Multiply value by 1000) $ 192

(97) Year of Improvement Cost Estimate 1995

(114) Future ADT 48

(115) Year of Future ADT 2045

CONDITION

(62) Culverts 8(61) Channel & Channel Protection 6(60) Substructure 7(59) Superstructure 6(58) Deck

N

INSPECTIONS *

(90) Inspection Date

(91) Frequency

(92) Critical Feature Inspection A: Fracture Critical Detail B: Underwater Inspection C: Other Special Inspection

Done Freq. (Mon) Date

* The inspection date and frequency information in this box contains the current NBI date and frequency information. Please refer to the report header for the date this inspection was conducted.

No No

08/10/2024

NBI SI&A

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

B.ID.01 Bridge Number

IDENTIFICATION

021306000001024

B.ID.02 Bridge Name W FORK OF SAN JUAN RIVER

B.ID.03 Previous Bridge No.

1954B.W.01 Year Built

B.L.01 State Code

B.L.02 County Code

B.L.03 Place Code

B.L.04 Highway Agency District

B.L.05 Latitude

B.L.06 Longitude

B.L.07 Border Bridge Number

B.L.08 Border Bridge State or Country Code

B.L.09 Border Bridge Insp. Resp.

B.L.10 Border Bridge Designated Lead State

B.L.11 Bridge Location

B.L.12 Metropolitan Planning Organization

LOCATION

8 - Colorado

37.44988333333333

-106.91113611111112

N

13.7 MI NNE OF PAGOSA SPG

B.RH.01A Bridge Railing Type

ROADSIDE HARDWARE

B.RH.01B Bridge Railing Year (YY)

B.RH.01C Bridge Railing Test Level

B.RH.02A Transition Type

B.RH.02B Transition Year (YY)

B.RH.02C Transition Test Level

B.G.01 NBIS Bridge Length

BRIDGE GEOMETRY

B.G.02 Total Bridge Length

B.G.03 Max Span Length

B.G.04 Min Span Length

B.G.05 Bridge Width Out-to-Out

B.G.06 Bridge Width Curb-to-Curb

B.G.07 Left Curb or Sidewalk Width B.G.08 Right Curb or Sidewalk Width

B.G.09 Approach Roadway Width

53.1

53.1

49.5

49.5

16.1

14.1

15.1

B.G.14 Sidehill Bridge

B.G.15 Irregular Deck Area

854.9B.G.16 Calculated Deck Area

B.G.10 Bridge Median

B.G.11 Skew

B.G.12 Curved Bridge

B.G.13 Max Bridge Height

0 - No median

B.LR.01 Design Load

B.LR.02 Design Method

B.LR.03 Load Rating Date

B.LR.04 Load Rating Method

B.LR.05 Inventory Load RF

B.LR.06 Operating Load RF

B.LR.07 Controlling Legal Load RF

B.LR.08 Routine Permit Loads

LOADS AND LOAD RATING

H15 - H-15

LRFR - Load and Resistance Factor R

0.62

0.8

B.IR.01 NSTM Inspection Required

INSPECTION REQUIREMENTS

N - NSTM inspection not required.

B.IR.02 Fatigue Details

B.IR.03 UW Inspection Required N - Underwater inspection not requi

B.IR.04 Complex Feature

B.C.01 Deck Condition Rating

COMPONENT CONDITION RATINGS

B.C.02 Superstructure Condition

B.C.03 Substructure Condition

B.C.04 Culvert Condition Rating

B.C.05 Bridge Railing Condition

B.C.06 Bridge Railing Transitions Condition

B.C.07 Bridge Bearings Cond.

B.C.08 Bridge Joints Condition

B.C.09 Channel Condition Rating

B.C.10 Channel Protection Condition

B.C.11 Scour Condition Rating

B.C.12 Bridge Condition Class

B.C.13 Lowest Condition Rating

B.C.14 NSTM Insp. Condition

B.C.15 UW Inspection Condition

6 - SATISFACTORY - Widespread

7 - GOOD - Some minor defects.

6 - SATISFACTORY - Widespread

N - NOT APPLICABLE - Component

4 - POOR - Widespread moderate

2 - CRITICAL - Major defects.

1 - Bridge is closed to traffi

F - Fair

6 - SATISFACTORY - Widespread

B.AP.01 Appr. Roadway Alignment

APPRAISAL

B.AP.02 Overtopping Likelihood

B.AP.03 Scour Vulnerability

B.AP.04 Scour Plan of Action

B.AP.05 Seismic Vulnerability

P - Poor

VLM-T - TEMP - Very low to moderate

AB-T - TEMP - Stable for scour, pos

0 - A scour POA is not required.

B.CL.01 Owner

CLASSIFICATION

B.CL.02 Maint. Responsibility

B.CL.03 Federal or Tribal Land Access

B.CL.04 Historic Significance

B.CL.05 Toll

B.CL.06 Emergency Evacuation Designation

FL07 - U.S. Forest Service (USFS)

FL07 - U.S. Forest Service (USFS)

N - Not Applicable

7 - Historic significance of the br

N - Bridge does not carry a toll ro

SNBI SI&A

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

B.SP.02 # of Spans 1

B.SP.03 # of Beam Lines

S-T - TEMP - steel - S01 or S0B.SP.04 Span Material

B.SP.05 Span Continuity

B.SP.06 Span Type

B.SP.07 Span Protective System

1 - Simple or single span

GB-T - TEMP - girder/beam - G0

B.SP.08 Deck Interaction

B.SP.09 Deck Material and Type CR-T - TEMP - concrete cast-in

C01 - Concrete – monolithicB.SP.10 Wearing Surface

B.SP.11 Deck Protective System

B.SP.12 Deck Reinforcing Protective System

B.SP.13 Deck Stay-In-Place Forms

0 - None

0 - None

M1

SPAN SETS

B.F.02 Feature Location C - Carried on bridge

B.F.03 Feature Name FDR 648

7 - LocalB.H.01 Functional Classification

B.H.02 Urban Code

B.H.03 NHS Designation

B.H.04 National Highway Freight Network

99999

N - Non-NHS

N - Not on the NHFN

B.H.09 Annual ADT 32

B.H.10 Annual ADTT

2002B.H.11 Year of Annual ADT

B.H.12 Highway Max Usable Vertical Clearance B.H.13 Highway Min Vertical Clearance B.H.14 Highway Min Horizontal Clearance, Left

99.9

99.9

N - Not a STRAHNET routeB.H.05 STRAHNET Designation

B.H.06 LRS Route ID

B.H.07 LRS Mile Point

B.H.08 Lanes On Highway

2.485

B.H.15 Highway Min Horizontal Clearance, Right B.H.16 Highway Max Usable Surface Width

B.H.17 Bypass Detour Length

B.H.18 Crossing Bridge Number

13.7

H1

HIGHWAY FEATURES

B.F.02 Feature Location B - Below bridge

B.F.03 Feature Name W FORK OF SAN JUAN RIVER

N - Not navigable watersB.N.01 Navigable Waterway

B.N.02 Navigation Min Vertical Clearance

B.N.03 Movable Bridge Max Navigation Vertical Clearance

B.N.04 Navigation Channel Width

B.N.05 Navigation Channel Min Horizontal Clearance B.N.06 Substructure Navigation Protection

W1

WATERWAY FEATURES

Highway Parent B.RT.01 Route Designation

B.RT.02 Route Number B.RT.03 Route Direction B.RT.04 Route Type B.RT.05 Service Type

H1 R01 648 2-T - TEMP - Two-way traffic - NS or EW 6 - Federal lands road 1 - Mainline

HIGHWAY ROUTES

POSTING STATUS DATA

B.PS.01 Load Posting Status B.PS.02 Posting Status Change Date

PO - Permanent - Open

LOAD EVALUATION AND POSTING

B.EP.01 Legal Load Configuration B.EP.02 Legal Load Rating Factor B.EP.03 Posting Type B.EP.04 Posting Value

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

INSPECTION SUMMARY

Inspection Type:

Inspection Begin Date:

Inspection Completion Date:

Inspection Team Lead:

Critical Finding

10/27/2025

10/27/2025

Jason Hefter

Inspection Equipment:

Inspection Interval:

Latitude: 37.44988333333333

Longitude: -106.91113611111112

Region: R2, ROCKY MOUNTAIN REGION

Security ID: 0213 - SAN JUAN NATIONAL FOREST

Inspection Team: TUCKER BOWMAN, BENJAMIN GLENN, JASON HEFTER

Complex Features:

NSTM Inspection Required: N - NSTM inspection not required.

Previous Bridge Number:

Development Status: EXISTING - ACTIVE

Structure Jurisdiction: FS - FOREST SERVICE

Inspection Responsibility: FS - FOREST SERVICE

Done By: FS - FOREST SERVICE

Fatigue Prone Details:

Underwater Inspection Required: N - Underwater inspection not required

Bridge Condition Classification: F - Fair Lowest Condition Rating Code: 6

Inspection Remarks: Damage from October 2025 flooding. Severe scour on right abutment resulting in strength and performance being affected. Critical finding resulting in bridge closure. Bridge was overtopped by flood event.

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

CONDITION & APPRAISAL DETAILS

B.C.01 Deck Condition Rating (6 - SATISFACTORY - Widespread minor or isolated moderate defects.)

B.C.02 Superstructure Condition Rating (7 - GOOD - Some minor defects.)

B.C.03 Substructure Condition Rating (6 - SATISFACTORY - Widespread minor or isolated moderate defects.)

B.C.04 Culvert Condition Rating (N - NOT APPLICABLE - Component does not exist.)

B.C.06 Bridge Railing Transitions Condition Rating (4 - POOR - Widespread moderate or isolated major defects;

strength and/or performance of the component is affected. )

Minor increases in previously damaged transition due to overtopping of bridge.

B.C.09 Channel Condition Rating (2 - CRITICAL - Major defects. Bridge or approach roadway is severely threatened.

Condition typically necessitates frequent monitoring, significant load restrictions, and/or corrective actions in order to keep the bridge open.)

Channel realigned to attack right abutment. Significant deterioration of upstream and downstream banks on both river left and river right. Bank revetment needed on all sides to prevent further erosion. Stream key piece material needed to realign stream to center channel. Large debris jam present on left abutment.

B.C.11 Scour Condition Rating (1 - Bridge is closed to traffic due to scour condition. Channel rehabilitation may return the bridge to service.)

Right abutment severely undermined - max 4.5 feet deep (measured toe to stream bed bottom) and 4 feet under center (measured toe towards back of abutment) .

Wearing Surface Condition (7 -GOOD)

Approach Roadway Condition (GOOD)

B.AP.01 Approach Roadway Alignment (P - Poor)

B.AP.02 Overtopping Likelihood (VLM-T - TEMP - Very low to moderate - 2 or 3 or 4)

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

B.AP.03 Scour Vulnerability (AB-T - TEMP - Stable for scour, possibly dependent on countermeasures - A or B)

B.AP.04 Scour Plan of Action (0 - A scour POA is not required.)

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

STREAM CROSS SECTION

Station Remark Horizontal Distance (ft) Vertical Distance US (ft) Vertical Distance DS (ft) Right abutment footer post 1 2 12.7 12.7

Post 2 8 14.5 17 Post 3 14 15.6 16.2 Post 4 20 14.1 14.6 Post 5 26 13.5 12.75 Post 6 32 12.2 12 Post 7 38 11.93 11.15 Post 8 44 9.4 9.45

Left abutment Post 9 50 7 6.75

0 10 20 30 40 50

Distance (ft)

El ev at io n (ft

Downstream Cross Section

0 10 20 30 40 50

Distance (ft)

El ev at io n (ft

Upstream Cross Section

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Date Reported: 10/22/2025

Priority: Critical Finding

Type of Work: Repair

Status: Open

Remarks

Hole may grow in size and should be reinspected to get exact measurements

Component: Substructure

Deficiency Description

Scour hole under right abutment to be filled with engineered structural fill. Approximately 16 cubic yards

MAINTENANCE ITEMS

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Date Reported: 10/22/2025

Priority: Critical Finding

Type of Work: Replace

Status: Open

Remarks

Component: Channel Protection

Deficiency Description

Channel protection is missing and needs to be replaced. Major repair work required to ensure bridge safety from future flooding. Approximately 145 cubic yards of channel protection used on river right side.

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

CRITICAL FINDINGS

Critical Finding ID:

Forest Specific Event Name: 2025 CO Oct10-13 FS Four Corners Monsoon Storms

CF Status: RO-Active

CF Inspection Date: 10/22/2025

CF Inspection Interval: 3

CF Found Date: 10/22/2025

Event Description/Cause (B4):

Rain

CF Criterion (B5): A - Immediate correction of scour or hydraulic problems needed

If Other (B5A):

Event Type/Cause (B12): B - Flood If Other (B12A):

Deterioration (B13): Other - Please explain If Other (B13A): Abutment undermining

Detailed Deficiency (B14): Other - Please explain If Other (B14A): Abutment undermining

CF Results (B15): D - Settlement or loss of support If Other (B15A):

Initial Actions (B17): Close bridge, place temporary riprap to divert flow to center of channel

10/22/2025

Resolved Actions (B19):

Future Actions (B20): Underpin or replace abutment, add scour countermeasures and stream training measures

CF Remarks:

Bridge closure in place as of 10/23/2025

Condition Summary: B.C.01 - 6 B.C.02 - 7 B.C.03 - 6 B.C.04 - N B.C.09 - 2 B.C.11 - 1

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

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Overtopping screenshot from public video taken from left side facing right Side profile right abutment scour

Plan view right abutment scour Left abutment

PHOTOS

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Looking upstream cross section Debris jam left side

Upstream left side erosion Looking downstream cross section

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Upstream left side erosion Upstream with measurement

Upstream Hole on upstream right wing wall

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Right approach Upstream wingwall erosion measurements- 4 feet long

Upstream wingwall erosion measurements- 4 feet wide

Upstream wingwall erosion measurements- 72 in deep

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Left approach Deck General

Damaged boxing glove Scour Right Abutment- 4 feet under footer under beam 3

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

-Scour Right Abutment- 3 feet under footer at downstream corner Scour Right Abutment- 3 feet under footer

Scour Right Abutment- -Center of bridge 4 feet under footer Upstream scour of right abutment wingwall

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Scour Right Abutment- 1.5 feet under front of footer

Footer to streambed measurements right abutment -2 feet

Footer to streambed measurements right abutment -3 feet

Footer to streambed measurements right abutment -4 feet

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Footer to streambed measurements right abutment -4 feet

Footer to streambed measurements right abutment -4.5 feet

Footer to streambed measurements right abutment -4 feet

Footer to streambed measurements right abutment -4 feet

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Footer to streambed measurements right abutment -3.5 feet

Footer to streambed measurements right abutment -4 feet

Scour Right Abutment-2.5 feet under footer Scour Right Abutment-2.2 feet under footer

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Scour Right Abutment-3 feet under footer downstream

Scour Right Abutment-1 foot under footer downstream

Downstream right bank erosion Downstream right bank erosion

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Curb spalling with exposed rebar Curb spalling with exposed rebar

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER

Team Lead: Jason Hefter, Inspection Date: 10/27/2025

Bridge Name: W FORK OF SAN JUAN RIVER