US Bridges

Grist Mill RD over Cedar Creek

Good

Clark County, Washington · 0.5N of Cedar Ck RD · Structure no. 086116000000000

Built
1994
31 years old
Condition
Good
inspected January 2024
Type
Truss - Thru
Wood or Timber
Length
85 ft
1 main span
Daily traffic
102
2017 count
Owner
County
County Highway Agency

About this bridge

Grist Mill RD over Cedar Creek is a wood or timber truss - thru carrying Grist Mill RD over Cedar Creek in Clark County, Washington. It was built in 1994, so it is 31 years old, younger than the Washington average of 49.8 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 102 vehicles a day, roughly 7% of them trucks, projected to reach 276 by 2043. The structure is 85 ft (25.9 m) long and 22 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesGrist Mill RD
CrossesCedar Creek
Location0.5N of Cedar Ck RD
RouteCounty Highway 61630
Coordinates45.93845, -122.5837
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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating95.7 US tons
Inventory rating62.5 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span83 ft (25.3 m)
Deck width22 ft (6.7 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic102 (2017)
Projected traffic276 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grist Mill RD over Cedar Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Grist Mill RD over Cedar Creek 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 January 2024.

How much traffic does Grist Mill RD over Cedar Creek carry?

About 102 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is Grist Mill RD over Cedar Creek?

The structure is 85 ft (25.9 m) long with a longest span of 83 ft (25.3 m) and a deck 22 ft wide.

Who owns Grist Mill RD over Cedar Creek?

It is owned by the County Highway Agency.