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Slate Creek Bridge - USFS 20N35/ 'New' Scales


Scales Rd off Quincy La Porte Rd

Looking NE

Photo taken by Craig Philpott in August 2010


BH Photo #173351


There are two roads referred to as "Scales" across Slate Creek: This bridge is in Yuba County on USFS road 20N35, a paved road closed indefinitely on the northern end. The pony truss & UCEB combo bridge upstream from this one is in Plumas County on Scales Road/YC 2/USFS road 20N63, a county-maintained gravel road.


Concrete monolithic bridge over Slate Creek on 20N35 (Scales)
Yuba County, California
Bridge is open from South approach, road closed on North approach.
Future prospects
Road is listed as "closed indefinitely".
Concrete monolithic girder with integrated solid pour side rails.
Length of largest span: 80.0 ft.
Total length: 129.0 ft.
Deck width: 12.0 ft.
Approximate latitude, longitude
+39.58660, -121.05818   (decimal degrees)
39°35'12" N, 121°03'29" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/666754/4383677 (zone/easting/northing)
Quadrangle map:
Strawberry Valley
Average daily traffic (as of 2007)
Inventory numbers
CA 16C-23 (California bridge number)
BH 11760 (Bridgehunter.com ID)
Inspection report (as of July 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 53.5 (out of 100)
View more at BridgeReports.com

Update Log 

  • April 16, 2019: Updated by Daniel: corrected location
  • August 22, 2010: Updated by Craig Philpott: Added photos
  • February 16, 2010: Updated by Craig Philpott: Added second county, bridge on county line



Scales Road Bridge - USFS
Posted April 22, 2019, by Erik Hoffman (edh4801 [at] gmail [dot] com)

By the way, I know this is mostly a UCEB, but I figured I'd keep this here to contrast with the pony truss upstream & avoid future confusion.

Scales Road Bridge
Posted April 16, 2019, by Erik Hoffman (edh4801 [at] gmail [dot] com)

Figured I could provide some more insight (local here):

The pony is on the actual Scales Road, which is a gravel road maintained by Yuba County.

This concrete bridge is not historically notable, and is on a Forest Service road about 5 miles downstream ALSO called Scales Road.

The collapsed road is the Forest Service one.

The pony on the county road was recently bypassed and kept open for pedestrians.

Adding to the confusion, the gravel county road is considered by the Forest Service as part of their road network, so they have assigned it a USFS number as well as the other Forest Service road.

But the gravel road is still county maintained.

Scales Road Bridge
Posted April 16, 2019, by Daniel

Ok, to explain the confusion...

https://www.fs.usda.gov/detail/plumas/news-events?cid=STELPR... lists the road with the pony as 20N63 Old Scales Road

the photos already here are from the road closed due to the landslide, 20N35, listed above as Scales Road.

I'll edit the location of this bridge to represent where the photos were taken. The name is reasonable.

I'll then create a new bridge to represent the location with the pony (and very modern UCEB next to it), called Old Scales Road Bridge.

I feel like somewhere I read that the bridge shown here was 1959... but I'm having trouble finding where I read that.

Sorry for the number of posts related to minor stuff, I'd just like the site to be correct.

Scales Road Bridge
Posted April 15, 2019, by Daniel

I'm now about 99% sure that Craig's photos here are of a different location, nearby. https://goo.gl/maps/kksPPJNhYGB2 39.586575, -121.058286 is where I believe the photos are. The bridge appears similar to the one in the photos, and the road to it is washed out.

Juniper Lane is 2 miles SW of Scales Road, on La Porte Road. It's an easy mistake to make in a remote area.

NBI says Scales is a pony truss, google maps shows what appears to be a pony truss (and a new UCEB next to it), and construction company photos show a pony truss.

What's the right thing to do? Change the name and location of someone else's bridge, so that their photos are of the right location, and create a new bridge for the location that they thought they were at?

Scales Road Bridge
Posted April 11, 2019, by Luke

There's several dams already added to BH.

Scales Road Bridge
Posted April 11, 2019, by Daniel

https://ceqanet.opr.ca.gov/2014092053/2 looks like it was most likely replaced, so I'm seeing this bridge and it's replacement.

But... scratch that. I don't believe the location of the photos here is correct, unless there's somewhere else that Scales Road crosses Slate Creek. http://www.4mengineers.com/current-projects-2/ has a photo showing a bridge with a pony truss as well as something else (in the configuration I'd expect) being replaced by a UCEB. I'll attach the photo. Also attaching a photo with the foundation in but not falsework.

Scales Road Bridge
Posted April 11, 2019, by Daniel

Google Maps Satellite View shows what I suspect is a pony truss just upstream. Am I looking at it wrong?

Or... is the bridge shown here the smaller bridge visible, and the current bridge an even newer one? Bing Maps doesn't show the larger bridge, so I think that's the most likely scenario: the bridge in the pictures here has been abandoned in place. On the southern side of the western span I see what sure looks like trusswork, but maybe I'm wrong.

I also see a dam not far upstream that I might have to check out next time I'm in the area. Is there a site similar to this for dams?

Scales Road Bridge
Posted July 30, 2013, by John S. (johngsaraba [at] frontiernet [dot] net)

Is the Scales road bridge over Slate creek still closed?

Scales Road Bridge
Posted August 23, 2010, by Craig Philpott (cphilpott [at] puc [dot] edu)

The description error on this bridge was a reference to the preceding 1930's bridge which was a pony truss. Description revised.

Scales Road Bridge
Posted August 23, 2010, by Robert Thompson

"Pony truss"? Looks like a typical UCEB to me...