BridgeReportCard
HomeColoradoBoulder County › All bridges

Every bridge in Boulder County, Colorado

321 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled

BridgeBuiltVehicles/dayCondition
US 36 Ml over Davidson Ditch201577,000Good
US 36 Ml over South Boulder Creek195177,000Good
US 36 Ml over Coal Creek201566,000Good
US 36 Ml over Canyon Creek195145,000Fair
SH 157 Ramp over US 36 Ml197144,000Fair
Table Mesa Drive over US 36 Ml195144,000Fair
SH 157 Ml over BNSF RR198143,000Fair
SH 157 Ml over Boulder Creek198143,000Fair
SH 157 Ml over Pearl Street198543,000Fair
SH 157 Ml over Skunk Creek197843,000Fair
SH 157 Ml over Walnut Street198143,000Fair
SH 157 Ml over North Goose Creek198642,000Fair
SH 157 Ml over South Goose Creek198642,000Fair
US 287 Ml over Draw199439,000Fair
US 287 over Draw199339,000Good
SH 157 Ml over Bear Canyon Creek197838,000Fair
South Boulder Rd over Drainage Ditch Ar199637,000Fair
SH 157 Ml over BNSF RR198834,000Fair
SH 157 Ml over Boulder Whiterock Ditch198734,000Fair
SH 157 Ml over SH 119 Ml198834,000Fair
SH 157 Ml over Wonderland Creek198734,000Fair
30th Street over Boulder Creek196333,663Fair
US 287 Ml over Coal Creek199632,000Good
Hover Road over Dry Creek No. 1198529,369Fair
SH 7 (arapahoe) over Bike/ped Underpass200629,000Fair
SH 7 Ml over Bear Canyon Creek198529,000Fair
SH 93 Ml over Ped. Underpass201327,000Fair
SH 93 Ml over Pedestrian Underpass199227,000Fair
Hover Road over St. Vrain River196026,762Fair
EB US 36 Off Ramp over EB Bus Ramp201626,000Good
SH 119 over Wonderland Crk and Path200626,000Fair
US 287 Ml over Lower Boulder Ditch199726,000Fair
Hover Road over Oligarchy Ditch199025,769Fair
SH 7 Ml over South Boulder Creek193825,000Fair
Pearl Parkway over Left Hand Ditch198124,744Fair
SH 119 ML E.Bnd over Left Hand Creek200324,000Good
SH 119 ML W.Bnd over Lefthand Creek200324,000Good
SH 119 Ml over Oligarchy Ditch200424,000Fair
SH170 ML(McCaslin) over US 36 Ml198324,000Fair
US 287 Ml over Boulder Creek198524,000Fair
US 287 Ml over Dry Creek199024,000Fair
US 287 Ml over Left Hand Creek194824,000Fair
US 287 Ml over St Vrain Creek201624,000Good
US 287 Ml over Draw199023,000Good
US 287 Ml over Highland Ditch199923,000Fair
SH 119 Ml NB over Beasley Ditch195822,000Fair
SH 119 Ml Sbnd over Beasley Ditch197122,000Fair
SH 119 Sbnd over Beasley Ditch197122,000Fair
SH 93 Ml over Boulder Creek200422,000Fair
US 287 Ml over Dry Creek194722,000Fair
30th Street over North Goose Creek199421,233Fair
Iris Ave over Elmers Two Mile Ditch200521,112Good
SH 157 Nbnd over Four Mile Canyon Creek198820,500Good
SH 157 Sbnd over Four Mile Canyon Creek198820,500Good
30th Street over Boulder Lefthand Ditch201120,225Good
SH 93 Ml over Skunk Creek / Ped Path201420,000Fair
SH 157 Ml Nbnd over South Boulder Road197319,000Fair
SH 157 Ml Sbnd over S BLDR Rd-TBLE MSA Dr197319,000Fair
SH 7 Ml over Draw192819,000Fair
SH 119 Nbnd over Dry Creek195918,500Good
US 36 Ml Ebnd over Boulder Creek196018,000Fair
US 36 Ml Wbnd over Boulder Creek195218,000Poor
McCaslin Blvd over Coal Creek199517,606Fair
SH 7 Ml over Coal Creek199017,000Good
SH 93 Ml over Bear Creek Ditch196917,000Good
SH 93 Ml over South Boulder Creek196917,000Fair
3rd Avenue over Oligarchy Ditch196916,797Fair
30th Street over Empson Ditch196316,733Fair
Ebnd US 36 Ml over US 36 Spur/baseline Rd196316,500Fair
US 287 Ml Sbnd over Rock Creek199416,500Good
US 287 Nbnd over Rock Creek199316,500Good
US 36 Wbnd Spur over US 36 Spur/baseline Rd199316,500Good
SH 93 Ml over Coal Creek196516,000Fair
US 36 Ml over Four Mile Canyon Creek195716,000Fair
US 36 Ml over Ped Underpath / Creek201516,000Good
96th Street over BNSF RR200615,821Good
96th Street over Coal Creek200615,821Good
Dillon Road over Coal Creek & Ped Tra199315,732Fair
County Line Road over Spring Gulch #2202115,509Good
Valmont Rd (CR 52) over South Boulder Creek200615,236Fair
SH 7 Ml Ebnd over Boulder Creek196615,000Fair
SH 7 Ml Wbnd over Boulder Creek193815,000Poor
US 36 Ml over Highland Canal197215,000Fair
US 36 Ml over Supply Ditch197215,000Fair
Baseline Road over Bear Canyon Creek198014,884Fair
Valmont Rd over Boulder Creek199914,324Good
9th Street over Boulder Creek197814,000Fair
SH 119 Ml Nbnd over Left Hand Creek195914,000Fair
SH 119 Ml Sbnd over Left Hand Creek197514,000Good
SH 52 Ml over Boulder Creek201114,000Good
Airport Road over Lykins Gulch200613,906Fair
Folsom Street over Boulder Whiterock Ditch197013,574Fair
Pike Road over Left Hand Creek199413,459Fair
Airport Road over St. Vrain River200613,131Good
Airport Road over St. Vrain River Overflow200613,131Fair
US 36 Ml over Left Hand Creek201913,000Good
S. Pratt Parkway over St Vrain Creek201912,909Good
E 9th Avenue over Oligarchy Ditch200412,630Fair
47TH Street over SH 157 Ml198912,000Fair
Nwp EB over US 287200212,000Fair
Nwp WB over EB Dillon Road200212,000Fair
Nwp WB over US 287200212,000Fair
SH 119 Ml Ebnd over St Vrain River200312,000Good
SH 119 Ml Wbnd over St. Vrain River200312,000Fair
Pratt Parkway over BNRR and 1st Avenue198011,924Fair
Broadway over Four Mile Creek/Bike Pth199411,874Fair
Martin Street over Saint Vrain River200911,759Fair
North 55th Street over Boulder Creek198511,600Fair
Rock Creek Pkwy. over Rock Creek199911,360Fair
Airport Road over Dry Creek199411,244Fair
N. 95th St (CR19) over Left Hand Creek200911,067Good
SH 42 Ml over Coal Creek196711,000Fair
Folsom Street over Goose Creek197010,980Fair
Valmont Road over Elmers Twomile Creek201010,720Good
27th Way over Skunk Creek200810,468Good
Arapahoe Avenue over Boulder Creek198810,452Good
Lookout Road over Boulder Cr. Supply Ditch199610,395Good
Lookout Road over Whiterock Ditch199610,395Fair
Pearl Parkway over S. Goose Creek Drainage198610,375Fair
Public Road over Coal Creek192710,350Fair
Airport Road (CR25 over Left Hand Creek200310,085Fair
6th Street over Boulder Creek197810,000Fair
County Road 1 over Big Dry Creek19959,859Fair
Boston Ave (CR 18) over St. Vrain Creek20249,636Good
17th Avenue over Spring Gulch20009,396Good
S Boulder Road over South Boulder Creek19869,270Fair
South Boulder Road over Viele Channel (Ditch)19759,270Fair
55th Street over Empson Ditch19969,146Fair
3rd Ave WB over Gw RR19749,116Poor
US 36 Ml over North St Vrain Creek20079,000Fair
US 36 Ml over North St Vrain Creek20079,000Good
N. 75th St (Cr 25) over Boulder Creek19788,907Fair
SH 52 Ml over White Rock Boulder Ditch19658,900Fair
Folsom Street over Boulder Creek19658,407Fair
Pearl Parkway over North Goose Creek19868,372Fair
US 36 Ml over St Vrain Creek20008,200Good
WB US 36 on Ramp over WB Bus Ramp/bike Path20168,180Good
88TH St. over US 36 Ml20008,157Good
120TH Street over Coal Creek19778,097Fair
95 Street (CR 19) over Boulder Creek20107,778Good
Rock Creek Pkwy over Community Ditch20007,760Poor
N. 95th St (Cr 19) over Liggett Ditch19847,744Good
3rd Ave. EB over Gw RR19697,667Fair
17th Street over Boulder Creek19857,658Fair
Pace Street over Spring Gulch20007,639Good
Colorado Avenue over Skunk Creek19797,343Fair
Price/Frontage Rds over Dry Creek19847,332Fair
Sunset Street over Saint Vrain Creek20167,282Good
Arapahoe Avenue over Boulder Creek19907,200Fair
Brockway Drive over Goodhue Ditch19626,900Fair
County Road 901 over Boulder Creek19766,549Fair
SH 119 Ml over Boulder Creek19536,400Fair
SH 119 Ml over Boulder Creek19536,400Fair
Nwp EB over EB Dillon Road20026,268Fair
County Road 31 over St. Vrain Creek19796,233Fair
SH 119 Ml over Middle Boulder Creek19335,800Fair
N. 61st Street over Boulder Creek19865,789Fair
CR 1 (Co Line Rd) over Lower Boulder Ditch19965,611Fair
Cherryvale Road over SH 36 Ml20095,525Fair
Dry Creek Drive over Dry Creek No. 119915,490Fair
County Road 1 over Coal Creek19965,198Fair
Niwot Road (CR 34) over Dry Creek19855,021Fair
Baseline Road (CR over South Boulder Creek19804,986Fair
Coalton Drive over Rock Creek20004,964Fair
SH 119 N/ebnd over Four Mile Creek19584,800Fair
S Pratt Parkway over Left Hand Creek20124,798Good
47th Street over South Goose Creek19864,774Fair
21st Ave Eastbound over Oligarchy Ditch19754,495Fair
County Road 33 over Left Hand Creek19804,344Fair
Moorhead Avenue over Skunk Creek19704,313Fair
SH 128 Ml over Coal Creek19674,100Fair
SH 119 Ml over North Beaver Creek19484,000Fair
Emma St. over US 287 Ml19943,969Fair
Alpine Street over Oligarchy Ditch19753,757Fair
Grandview Meadow D over Dry Creek20043,692Good
Glenwood Drive over Two Mile Creek19723,439Fair
120TH Street over Rock Creek19863,390Fair
N. 119th St (Cr 3) over St. Vrain Creek19883,288Good
N. 63rd St (CR39) over Leggett Ditch20153,275Good
SH 119 Ml over North Boulder Creek19483,200Fair
Cherryvale Road (C over Davidson Ditch19733,123Fair
Cherryvale Road over Davidson Ditch19863,123Fair
Nelson Rd (Cr 20) over Boulder Feeder Ditch19502,692Fair
Kalmia Avenue over Dry Creek20172,621Good
N 63rd St (CR 39) over Lefthand Creek20112,610Good
SH 7 Ml over North St Vrain Creek19552,600Fair
Martin Street over Left Hand Creek20162,572Good
Co Rd 3 / 119th S over Dry Creek No 220132,541Good
Harvard Street over Oligarchy Ditch19982,509Good
Flagstaff Rd CR56 over HIllside Slide20142,463Good
Flagstaff Rd CR56 over Hillside Slide19962,463Good
Moorhead Avenue over Bear Creek: Bike Path19952,461Fair
83rd St (CO Rd 23) over Little Thompson River20172,443Good
Kenosha Rd (CR 38) over Coal Creek19652,305Fair
Flatiron Parkwy over Dry Creek19852,240Fair
Niwot Road (CR 34) over Boulder Feeder Canal20102,084Good
McConnell Dr. over Saint Vrain Creek Ovrflw20182,031Good
McConnell Drive over Saint Vrain Creek20062,031Fair
Iris Avenue over Wonderland Creek20201,988Fair
N. 95th St (CR10) over Highland Ditch19891,968Good
Fordham Street over Dry Creek19971,944Fair
Iris Avenue/34 St over Wonderland Creek20171,937Fair
Indiana Avenue over Rock Creek19991,916Fair
Marshall Road over Coal Creek20221,867Good
Eisenhower Drive over Empson Ditch19721,860Fair
South Bowen Street over Left Hand Creek19651,835Poor
SH 7 Ml over North St Vrain Creek19731,800Fair
Deerwood Drive over Oligarchy Ditch20001,709Fair
Mohawk Drive over Bear Crk and Bike Path19961,707Good
CoRd94(LH Cnyn RD) over Lefthand Creek20161,681Good
County Road 38 over Boulder Creek19881,640Fair
104TH Street over Nwp20021,520Fair
SH 72 Ml over South Boulder Creek19791,500Fair
Junction Pl over Goose Creek20171,484Fair
Junction Place over Boulder and Left Hand Di20211,484Good
County Road 94 over Lefthand Creek20191,441Fair
No. 30th Street over Four Mile Creek19731,424Poor
SH 72 Ml over Middle St Vrain Creek19591,400Fair
Mountain Dr. over Clover Basin Ditch20181,399Good
E 5th Avenue over Oligarchy Ditch19701,321Fair
SH 170 Ml over Community Ditch19991,300Fair
South Sunset St. over Left Hand Creek20001,274Good
US 36 Fr Rd over Boulder Creek SR19521,264Poor
Olympia Avenue over Spring Gulch20001,207Good
34th Street over Wonderland Creek20181,200Good
SH 170 Ml over Davidson Ditch19521,200Fair
Monroe Drive over Empson Ditch20201,175Fair
Woodland Rd (CR4) over Highland Ditch19761,163Fair
NWP Ramp over EB Dillon Road20021,100Fair
SH 72 Ml over South St Vrain Creek19591,100Fair
CR 62 (Empire Dr) over Coal Creek19351,080Fair
Lefthand Canyon Dr over Lefthand Creek20191,078Good
Horizon Avenue over Rock Creek20001,043Fair
Spring Drive over Davidson Ditch19701,022Good
Twin Lakes Road over BLDR and Whiterock Ditch19751,018Fair
St Vrain Road CR16 over Boulder Feeder Ditch19551,009Fair
Spencer Street over Oligarchy Ditch1975995Fair
Boston Ave over Spring Gulch2017978Fair
Second Avenue over St. Vrain Creek2021946Good
Sterling Drive over Left Hand Ditch1975937Fair
County Road 132 over Boulder Creek1935846Fair
Kingsridge Blvd. over Wonderland Creek1988812Fair
County Road 81 over James Creek2019777Good
County Road 130 over Middle Boulder Creek1990742Fair
Co Rd 39 (65th St) over Lykins Gulch2012741Good
County Road 81 over Lefthand Creek2019735Good
Hygiene Rd (Cr 10) over Boulder Feeder Ditch1987692Good
Juniper Avenue over Elmers Two Mile Ditch1965666Fair
48th Street over Goose Creek1980664Good
Martin Drive over Bear Crk and Bike Path1995662Fair
Golf Club Drive over Local Drainage2005644Good
48th CT over S. Goose Creek1986641Good
County Road 84S over South St. Vrain Creek1990637Fair
Winding Trail Dr over Wonderland Creek2018632Fair
Wagonwheel Gap Rd over Fourmile Creek2019630Good
Fairways Drive over Local Drainage2005622Good
Wagonwheel Gap Rd over Four Mile Creek2019587Good
Independence Ave. over Boulder & Whiterock Dtch1973574Fair
Kalmia Avenue over Elmers Two Mile Ditch1973551Fair
Sunset Way over Dry Creek1996540Fair
SB Table Mesa Dr. over Bear Creek1980508Fair
Hygiene Rd (Cr 10) over St. Vrain Creek1981502Fair
2nd Avenue over Coal Creek1992492Fair
Wagonwheel Gap Rd over Fourmile Creek2019460Good
Dillon Road over Rock Creek2019451Good
15th Avenue over Oligarchy Ditch1989450Fair
N 115th St over Highland Ditch2012435Good
Oxford Rd (CR 26) over Boulder Feeder Ditch1950422Fair
Wagonwheel Gap Rd over Four Mile Creek2019407Good
SH 170 Ml over South Boulder Creek1930388Fair
Monarch Road over Dry Creek2019349Good
Golf Club Drive over Local Drainage2005318Good
Marshall Rd (CR 51 over South Boulder Creek1988318Fair
County Road 47 over St. Vrain Supply Canal1997316Fair
Gilpin Drive over Bear Canyon Creek1997281Good
Mc Sorley Lane over South Boulder Creek1970272Fair
County Road 80 over North St. Vrain Creek1988268Fair
County Road 1 over New Ish Ditch1980260Fair
Wildwood Road over Bear Canyon Creek1970242Good
Logan Mill Road over Four Mile Creek2019238Fair
Aurora Avenue over Gregory Creek1980226Good
N 41st St (Cr 59) over Left Hand Creek1960226Fair
County Road 124E over North Boulder Creek1994214Fair
Boulder Hills Dr over Boulder Feeder Ditch1980209Fair
27th Street over Goose Creek2001201Good
Nfsr 112.0 over South St Vrain Creek2011200Good
County Road 80 over North St. Vrain Creek1988199Fair
Fdr 114 over Middle St. Vrain Creek1952198Good
N 49th St (Cr 51) over Left Hand Creek1993191Good
N 81st St (CR 31) over Left Hand Creek1992182Good
Main Street over James Creek2018180Good
Prospect Road CR24 over Boulder Feeder Ditch1988180Fair
County Road 71 over North St. Vrain Creek1991178Fair
County Road 103 over Middle St. Vrain Creek1993170Fair
CR124E-Hummer Dr. over North Boulder Creek1994135Fair
C. R. 41 (63rd St) over St. Vrain Creek1991134Fair
Bow Mountain Rd. over Fourmile Creek2019124Good
County Road 84W over North St. Vrain Creek1927122Fair
County Road 26 over Left Hand Creek1991121Good
Anderson Hill St over James Creek2016117Good
County Road 103 over Middle St. Vrain Creek1993112Good
Sixth St (CR 130) over Middle Boulder Creek2005106Fair
Niwot Meadow Farm over Dry Creek No 22005102Fair
Strath Street over Left Hand Creek197092Fair
Fdr 114 over Middle St. Vrain Creek195290Good
County Road 128E over North Boulder Creek199480Fair
Rogers Road over Lykin Gulch200080Fair
County Road 35 over St. Vrain Creek199678Fair
Wild Basin Road over North St. Vrain Creek198275Fair
Wild Basin Road over North St. Vrain Creek198275Fair
County Road 116 over Boulder Creek199574Fair
Co Rd 54A over Middle Boulder Creek191770Fair
County Road 84S over South St. Vrain Creek201967Fair
Co Rd 54A over Middle Boulder Creek191766Fair
County Road 96 over South St. Vrain Creek200064Fair
County Road 9 over Boulder Creek196059Fair
County Road 103 over Middle St. Vrain Creek192756Fair
Fdr 112 over South St Vrain Creek198950Fair
Fdr 298 & Bc 116 over North Boulder Creek197040Fair
Boulder Creek Path over Boulder Creek202011Fair
Spring Creek Place over Wonderland Creek2017Good

Source: FHWA National Bridge Inventory, 2025.

Boulder County bridge conditions · Colorado bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.