County profile · official public datasets

Summit County, UT

138 public highway bridges tracked in the FHWA National Bridge Inventory: 14.5% rated Good, 81.2% Fair, 4.3% Poor.

138
Public bridges
14.5%
Good condition
4.3%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Summit County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

23rd
of 29 on Poor share
4.3%
Poor-condition share
138
public highway bridges
1982
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Summit County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Summit County ranks #23 of 29 Utah counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.3%). Summit County, Utah contains 138 public highway bridges. Roughly 14.5% are rated “Good,” 81.2% “Fair,” and 4.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

138

Public highway bridges in Summit County

Good condition

14.5%

20 of 138 rated 7-9

Fair condition

81.2%

112 of 138 rated 5-6

Poor condition

4.3%

6 of 138 rated 4 or below

In-state Poor-share rank

#23 of 29

Among Utah counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 138 NBI-tracked bridges by lowest applicable component rating.

Good
14.5% (20)
Fair
81.2% (112)
Poor
4.3% (6)

Summit County's Poor-condition bridges carry 3,887 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 4.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 648 crossings a day against 7,691 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 137 of 138 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

43.5% of Summit County's bridges have passed the 50-year mark

60 of the 138 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 14.5% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 49.2% of the county's Poor-condition bridge traffic

SR-32 over WEBER RIVER, built 1955, carries 1,914 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 3,887 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Summit County's bridges were built

138 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2000s, when 25 of the county's bridges still in the inventory were built, which is 18.1% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1982) matches the Utah average (1984).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Summit County compares with Utah's closest counties by inventory size

The 5 Utah counties nearest Summit County in number of bridges, with their condition splits. Its 4.3% Poor share is the 5th-lowest of these 6. Its average build year of 1982 against a peer-group mean of 1982 is in line with the group.

Showing the 5 closest of 28 Utah counties eligible for comparison.

Bridge inventory size and condition shares for Summit County and the 5 Utah counties closest to it in inventory size
County Bridges Poor
Sevier County 157 0.6%
Davis County 139 0.7%
Summit County (this page) 138 4.3%
Weber County 129 4.7%
Emery County 126 0.8%
Grand County 121 0%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Summit County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Summit County, both outside Utah so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside UT (138 bridges here).

Similar average build year

Nearest mean year-built outside UT (1982 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 138 Good 20 Fair 112 Poor 6

All bridges (138)

US-40 WB. RAMP

Fair

Over: I-80 (SR-80) EBL

SILVER CREEK JCT. INTCHG., Summit, UT

Built 2001 Load: 52.2 t ADT: 11,861

SR-248

Fair

Over: WEBER-PROVO DIVR CA

.5 MILE WEST OF KAMAS, Summit, UT

Built 1989 Load: 53.8 t ADT: 6,763

WOODEN SHOE LANE

Fair

Over: WEBER RIVER

1.5 MILE SOUTH OF PEOA, Summit, UT

Built 1996 Load: 57.7 t ADT: 358

US-40 (SR-40) EBL

Fair

Over: SR-248 INTCHG. X-RD

EAST PARK CITY INTERCHG., Summit, UT

Built 1989 Load: 58.0 t ADT: 37,244

US-40 (SR-40)WBL

Fair

Over: SR-248 INTCHG. X-RD

EAST PARK CITY INTERCHG., Summit, UT

Built 1989 Load: 58.0 t ADT: 37,244

SR-32

Fair

Over: WEBER-PROVO DIV. CANAL

1.5 MILE WEST OF FRANCIS, Summit, UT

Built 1985 Load: 58.3 t ADT: 3,244

US-40 (SR-40) WBL

Fair

Over: SILVER CREEK & ABD.R

.4 MI.SE.PARK CITY INTCHG, Summit, UT

Built 1989 Load: 59.3 t ADT: 28,845

COUNTY ROAD

Fair

Over: WEBER RIVER

0.5 MILE NE. OF WANSHIP, Summit, UT

Built 1993 Load: 61.2 t ADT: 3,043

COALVILLE MAIN ST.

Fair

Over: CHALK CREEK

200 NO. MAIN COALVILLE, Summit, UT

Built 1992 Load: 64.2 t ADT: 1,373

I-80 (SR-80) EBL

Fair

Over: ECHO CREEK

6 MI.W.OF WYOMING STATE L, Summit, UT

Built 1961 Load: 86.2 t ADT: 16,959

I-80 (SR-80)

Fair

Over: I-80 RAILS to TRAILS

3.2 Mi.Northeast Wanship, Summit, UT

Built 2008 Load: 90.5 t ADT: 16,767

SR-32

Fair

Over: WEBER RIVER OVERFLOW

WITHIN TOWN OF OAKLEY, Summit, UT

Built 1977 Load: 96.6 t ADT: 2,859

COUNTY ROAD

Good

Over: WEBER RIVER OVERFLOW CH.

1.5 MIILES NW. OF PEOA, Summit, UT

Built 1948 Load: 11.0 t ADT: 3,382

COUNTY ROAD

Good

Over: MIDDLE FORK WEBER RIVER

2.5 MI. E.OF HOLIDAY PARK, Summit, UT

Built 1950 Load: 11.3 t ADT: 844

ROAD 80051

Good

Over: MOOREHOUSE CREEK

LEDGEFORK CAMPGROUND, Summit, UT

Built 2012 Load: 14.3 t ADT: 50

FOREST RD 80082

Good

Over: BEAVER CREEK

4.5 MILE SO. W. OF WYO, Summit, UT

Built 1951 Load: 17.2 t ADT: 50

ROAD 80065

Good

Over: WEST FK. OF BLACKSFORK R

17 MI EAST OF U-150, Summit, UT

Built 1976 Load: 24.9 t ADT: 50

SR-224

Good

Over: PEDESTRIAN UNDERPASS

South of Olympic Parkway, Summit, UT

Built 2011 Load: 25.3 t ADT: 32,675

ROAD 80072

Good

Over: SMITHS FORK RIVER

27 MI SO OF MTN. VIEW WYO, Summit, UT

Built 1977 Load: 27.2 t ADT: 50

ROAD 80073

Good

Over: BLACKS FORK RIVER

19 MI E. OF U-150 ON 058, Summit, UT

Built 1976 Load: 28.2 t ADT: 50

SR-65

Good

Over: I-84

SR-65 over I-84, Summit, UT

Built 2021 Load: 32.4 t ADT: 1,745

FOREST RD 80082

Good

Over: HENRYS FORK RIVER

15.5 MI. FROM LONETREE WY, Summit, UT

Built 2009 Load: 32.7 t ADT: 50

ROAD BRIDGE

Good

Over: BEAVER CREEK

NO DATA ENTERED, Summit, UT

Built 2012 Load: 32.7 t ADT: 50

100 WEST STREET

Good

Over: WEBER-PROVO DIV. CANAL

225 N. 100 W. KAMAS, Summit, UT

Built 2007 Load: 35.0 t ADT: 171

200 NORTH STREET

Good

Over: WEBER-PROVO DIV. CANAL

125 W. 200 N. KAMAS, Summit, UT

Built 2007 Load: 36.3 t ADT: 126

I-80EB (SR-80)

Good

Over: SR-32

At the WANSHIP INTERCHG., Summit, UT

Built 2012 Load: 36.3 t ADT: 16,767

BROWNS CANYON ROAD

Good

Over: WEBER RIVER

1.5 MILES NW. OF PEOA, Summit, UT

Built 2007 Load: 36.9 t ADT: 3,382

US-40

Good

Over: Ped / Wildlife Trail

.8 Mi E of Silver Creek, Summit, UT

Built 2015 Load: 40.8 t ADT: 37,244

US-40

Good

Over: Ped / Wildlife Trail

1.8 Mi E of Silver Creek, Summit, UT

Built 2015 Load: 40.8 t ADT: 37,244

I-80 (SR-80) EBL

Good

Over: RR. TRAIL @ ATKINSON CY.

1.4 MI.E.Silver Creek Int, Summit, UT

Built 2012 Load: 41.1 t ADT: 18,438

ROAD 80073

Good

Over: STEEL CREEK

4 MILES EAST OF D4 D5 BDY, Summit, UT

Built 2000 Load: 42.1 t ADT: 50

SR-150

Good

Over: THORN CREEK DIVERSION

KAMAS MOUTH of CANYON, Summit, UT

Built 2004 Load: 42.8 t ADT: 1,402

ROAD 80051

Poor

Over: RED PINE CREEK

ENTRANCE TO LEDGEFORK CG, Summit, UT

Built 1953 Load: 19.1 t ADT: 50

COUNTY ROAD

Poor

Over: WEBER-PROVO DIV. CANAL

1.5 MILES SW. OF KAMAS, Summit, UT

Built 1960 Load: 20.7 t ADT: 437

SR-32

Poor

Over: WEBER RIVER

5.5 MI.SE.of WANSHIP, Summit, UT

Built 1955 Load: 29.2 t ADT: 1,914

COUNTY ROAD

Poor

Over: SMITH AND MOREHOUSE CR

9.5 MILES NE. OF OAKLEY, Summit, UT

Built 1996 Load: 32.4 t ADT: 1,109

CO.RD. F# 2600

Poor

Over: SMITH-MOOREHOUSE CK.

1/4 MI. S. OF JCT. CO. RD, Summit, UT

Built 1950 Load: 39.5 t ADT: 23

SR-302

Poor

Over: WEBER RIVER

Entr.to Rockport St. Park, Summit, UT

Built 2009 Load: 60.9 t ADT: 354

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.