S-07 Case study

Gardner River High Bridge

Bid plans against Amendment 1. 7 sheets paired, 46 changes found, Yellowstone National Park, Wyoming.

The Federal Highway Administration and the National Park Service are not Sheetshift customers and did not take part. These are public bid drawings prepared by the US Government, which carry no copyright, run through Sheetshift for transparency.

Drawings prepared by Federal Highway Administration, Western Federal Lands Highway Division. Issued by National Park Service, Yellowstone National Park.

Public bid notice and amendment on SAM.gov (solicitation 69056726R000002)

sheets paired: 7
old sheets not re-issued: 64
changes found: 46
inside a cloud: 9
design changes outside every cloud found: 12
clouds found: 13

Listed apart, not counted as design changes: 5 revision records, 12 designer marks, 47 plotting-noise differences.

S-07.1 The sheets

Sheet by sheet.

Sheet	Changes found	Inside a cloud	Outside every cloud	Set aside as noise
D.3 — title needs confirmation	7	3	0	2
F.3 — title needs confirmation	17	8	3	15
S.2 — General Notesfrom the drawing index	7	4	2	0
S.4 — Approach Span Sectionsfrom the drawing index	3	1	0	0
S.5 — Approach 1 Slabfrom the drawing index	7	3	3	1
S.6 — Approach 2 Slabfrom the drawing index	1	0	0	0
S.7 — Approach Span Reinforcementfrom the drawing index	4	0	4	29

S-07.2 The written list

What the designers wrote, against what was found.

The designers' own list, matched by Sheetshift, not yet checked by a person.

D.3 · Plan sheet # D.3 Adds additional information and drawings.

Found: C-001

C-001Wording or number changedMedium

Design changeInside a cloud

Values: SureCoverage: Complete

The label pointing to the dashed box changed from 'Existing bridge' to 'Construction limits'.

Old: Existing bridge
New: Construction limits

label text: Existing bridge → Construction limits

Sheetshift AI suggests. Needs an engineer's confirmation.

F.3 · Plan sheet # F.3 Adds additional information and drawings.

Found: 10 changes

S.02 · Plan sheet # S.02 Adds additional information.

Found: C-042

C-042Wording or number changedHigh

Design changeInside a cloud

Values: SureCoverage: Complete

The general notes list was expanded from 6 notes to 10 notes, adding detailed descriptions for repairs, rivets, and quantities.

Old: NOTES: (1) Contract quantity. (2) Includes cost of removal, reinforcing steel, end guard angles, and drainage system. (3) Includes cost of removal, excavation, foundation fill, reinforcing steel, and backfill.
New: NOTES: (1) Contract quantity. (2) Includes cost of removal, reinforcing steel, end guard angles, and drainage system. (3) Includes cost of removal, excavation, foundation fill, reinforcing steel, and backfill.

Note (4): Includes cost of misc. steel repair, cleaning and lubricating bearing, repairing damaged existing railing (5 Locations), and new railing improvements. → Includes cost of misc. steel repair, cleaning and lubricating bearing, repairing damaged existing railing, and new railing improvements.
Note (5): 155,000 SQFT (Information Only Quantity) → Includes repair of damaged bridge railing at 5 Locations. Extent of each repair location defined by a single post and the two adjacent spans of railing.
Note (6): 23,550 SQFT (Information Only Quantity) → 150 misshapen/misinstalled rivets, and 20 missing rivets (Information Only Quantity)
Note (7): nothing → 180 plank attachment assemblies, 45 floor beam hanger assemblies, and 15 cable railing u-bolt assemblies (Information Only Quantity)
Note (8): nothing → 155,000 SQFT (Information Only Quantity)
Note (9): nothing → 800 LNFT (Information Only Quantity)
Note (10): nothing → 23,550 SQFT (Information Only Quantity)

May affect Structural steel and connections: Notes describe specific quantities of rivets, plank attachments, and hanger assemblies.

Re-check: Re-check steel repair quantities and scope.

Sheetshift AI suggests. Needs an engineer's confirmation.

S.04 · Plan sheet # S.04 Adds additional information.

Found: C-049

C-049Wording or number changedMedium

Design changeInside a cloud

Values: SureCoverage: Complete

The stirrup bar mark changed from #4B5 to #4B4 under revision 1.

Old: #4B5 Stirrup (typ.)
New: #4B4 Stirrup (typ.)

bar mark: #4B5 Stirrup → #4B4 Stirrup
stirrup bar mark: #4B5 Stirrup (typ.) → #4B4 Stirrup (typ.)
revision triangle: nothing → 1

May affect Reinforcement: The stirrup bar mark changed from #4B5 to #4B4.

Re-check: Check the bar bending schedules and order lists for the correct stirrup mark.

Sheetshift AI suggests. Needs an engineer's confirmation.

S.05 · Plan sheet # S.05 Adds additional information.

Found: C-056

C-056Member size changedHigh

Design changeInside a cloud

Values: SureCoverage: Partial

Not yet explained: “1” on the new sheet.

The bar size changed from #4S13 to #4S7.

Old: #4S13 @ 2'-8" Str. (Typ.)
New: #4S7 @ 2'-8" Str. (Typ.)

bar callout: #4S13 @ 2'-8" Str. (Typ.) → #4S7 @ 2'-8" Str. (Typ.)

May affect Reinforcement: The bar size changed from #4S13 to #4S7.

Re-check: Verify the correct bar size is ordered and installed.

Sheetshift AI suggests. Needs an engineer's confirmation.

S.06 · Plan sheet # S.06 Adds additional information.

Not found

S.07 · Plan sheet # S.07 Adds additional information.

Found: C-061

C-061Wording or number changedHigh

Design changeNot marked

Values: Fairly sureCoverage: Complete

Bar marks #6S8 and #6S16 were changed to #4S8 and #4S16 respectively, with revision 1 tags added.

Old: #6S8 and #6S16
New: #4S8 and #4S16

bar mark #6S8: #6S8 → #4S8
bar mark #6S16: #6S16 → #4S16

The table as it was and as it is now. Changed cells are highlighted.
	#4S8	4	14	0'-2"	Guard Angle
(header)	#6S8#4S8	·	·	·	·
#4S16	#4S16	4	14	0'-2"	Guard Angle
#6S16	#6S16removed	4removed	14removed	0'-2"removed	Guard Angleremoved

May affect Reinforcement: Bar marks changed in the schedule

Re-check: Re-check bar schedule and procurement list for #4S8 and #4S16

Sheetshift AI suggests. Needs an engineer's confirmation.

S-07.3 Where it fell short

What this run missed or got wrong.

Listed here because a checker that only shows its wins cannot be trusted.

S.06: the written item “Plan sheet # S.06 Adds additional information.” was not found among the changes.
47 more differences were set aside as probably not a design change. Nothing is deleted; a person can show them again.
12 of the 29 design changes sit outside every cloud Sheetshift found. Whether each is a real design change, or a cloud the designer drew that Sheetshift did not recognise, is for a person to judge from the crops below.

S-07.4 Changes

The changes, with their crops.

Real changes from this run, old on the left and new on the right.

C-049Wording or number changedMedium

Design changeInside a cloud

Values: SureCoverage: Complete

The stirrup bar mark changed from #4B5 to #4B4 under revision 1.

Old: #4B5 Stirrup (typ.)
New: #4B4 Stirrup (typ.)

bar mark: #4B5 Stirrup → #4B4 Stirrup
stirrup bar mark: #4B5 Stirrup (typ.) → #4B4 Stirrup (typ.)
revision triangle: nothing → 1

May affect Reinforcement: The stirrup bar mark changed from #4B5 to #4B4.

Re-check: Check the bar bending schedules and order lists for the correct stirrup mark.

Sheetshift AI suggests. Needs an engineer's confirmation.

C-061Wording or number changedHigh

Design changeNot marked

Values: Fairly sureCoverage: Complete

Bar marks #6S8 and #6S16 were changed to #4S8 and #4S16 respectively, with revision 1 tags added.

Old: #6S8 and #6S16
New: #4S8 and #4S16

bar mark #6S8: #6S8 → #4S8
bar mark #6S16: #6S16 → #4S16

The table as it was and as it is now. Changed cells are highlighted.
	#4S8	4	14	0'-2"	Guard Angle
(header)	#6S8#4S8	·	·	·	·
#4S16	#4S16	4	14	0'-2"	Guard Angle
#6S16	#6S16removed	4removed	14removed	0'-2"removed	Guard Angleremoved

May affect Reinforcement: Bar marks changed in the schedule

Re-check: Re-check bar schedule and procurement list for #4S8 and #4S16

Sheetshift AI suggests. Needs an engineer's confirmation.

C-042Wording or number changedHigh

Design changeInside a cloud

Values: SureCoverage: Complete

The general notes list was expanded from 6 notes to 10 notes, adding detailed descriptions for repairs, rivets, and quantities.

Old: NOTES: (1) Contract quantity. (2) Includes cost of removal, reinforcing steel, end guard angles, and drainage system. (3) Includes cost of removal, excavation, foundation fill, reinforcing steel, and backfill.
New: NOTES: (1) Contract quantity. (2) Includes cost of removal, reinforcing steel, end guard angles, and drainage system. (3) Includes cost of removal, excavation, foundation fill, reinforcing steel, and backfill.

Note (4): Includes cost of misc. steel repair, cleaning and lubricating bearing, repairing damaged existing railing (5 Locations), and new railing improvements. → Includes cost of misc. steel repair, cleaning and lubricating bearing, repairing damaged existing railing, and new railing improvements.
Note (5): 155,000 SQFT (Information Only Quantity) → Includes repair of damaged bridge railing at 5 Locations. Extent of each repair location defined by a single post and the two adjacent spans of railing.
Note (6): 23,550 SQFT (Information Only Quantity) → 150 misshapen/misinstalled rivets, and 20 missing rivets (Information Only Quantity)
Note (7): nothing → 180 plank attachment assemblies, 45 floor beam hanger assemblies, and 15 cable railing u-bolt assemblies (Information Only Quantity)
Note (8): nothing → 155,000 SQFT (Information Only Quantity)
Note (9): nothing → 800 LNFT (Information Only Quantity)
Note (10): nothing → 23,550 SQFT (Information Only Quantity)

May affect Structural steel and connections: Notes describe specific quantities of rivets, plank attachments, and hanger assemblies.

Re-check: Re-check steel repair quantities and scope.

Sheetshift AI suggests. Needs an engineer's confirmation.

C-056Member size changedHigh

Design changeInside a cloud

Values: SureCoverage: Partial

Not yet explained: “1” on the new sheet.

The bar size changed from #4S13 to #4S7.

Old: #4S13 @ 2'-8" Str. (Typ.)
New: #4S7 @ 2'-8" Str. (Typ.)

bar callout: #4S13 @ 2'-8" Str. (Typ.) → #4S7 @ 2'-8" Str. (Typ.)

May affect Reinforcement: The bar size changed from #4S13 to #4S7.

Re-check: Verify the correct bar size is ordered and installed.

Sheetshift AI suggests. Needs an engineer's confirmation.

C-001Wording or number changedMedium

Design changeInside a cloud

Values: SureCoverage: Complete

The label pointing to the dashed box changed from 'Existing bridge' to 'Construction limits'.

Old: Existing bridge
New: Construction limits

label text: Existing bridge → Construction limits

Sheetshift AI suggests. Needs an engineer's confirmation.

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