US Bridges

IRR CO RD 90 over Pit River Overflow

Good

Modoc County, California · 0.3 MI East of Lookout RD · Structure no. 03C0125

Built
2001
24 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
127 ft
4 main spans
Daily traffic
25
2010 count
Owner
County
County Highway Agency

About this bridge

IRR CO RD 90 over Pit River Overflow is a concrete continuous slab carrying IRR CO RD 90 over Pit River Overflow in Modoc County, California. It was built in 2001, so it is 24 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 25 vehicles a day, roughly 5% of them trucks, projected to reach 84 by 2045. The structure is 127 ft (38.7 m) long and 28 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesIRR CO RD 90
CrossesPit River Overflow
Location0.3 MI East of Lookout RD
RouteCounty Highway 0
Coordinates41.29217, -121.12723
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length127 ft (38.7 m)
Longest span36 ft (10.9 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2010)
Projected traffic84 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR CO RD 90 over Pit River Overflow built?

It was built in 2001, making it 24 years old in 2025.

What condition is IRR CO RD 90 over Pit River Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does IRR CO RD 90 over Pit River Overflow carry?

About 25 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is IRR CO RD 90 over Pit River Overflow?

The structure is 127 ft (38.7 m) long with a longest span of 36 ft (10.9 m) and a deck 28 ft wide.

Who owns IRR CO RD 90 over Pit River Overflow?

It is owned by the County Highway Agency.