Openings · last 7 days
3
Booking reality
Campsite Sniper detected 3 site openings here in the last 7 days
01 · Detected Opening History · the openings record · file CS-234534
When Union Flat reopens
Union Flat's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 30 days
6
Openings · last 90 days
6
Only 6 openings in the last 90 days: not enough recent activity for a reliable pattern. A free Campsite Sniper alert watches around the clock instead, and pings you the moment one opens.
02 · Availability Outlook · Sep 18 – Oct 15, 2026 · of 11 monitored sites
Of the 308 tracked site-nights (Sep 18 – Oct 15, 2026): 195 open for online reservation · 63 reserved · 50 on sites not offered for online reservation (first-come, first-served or administrative). Of the facility's 11 monitored sites, 10 can be reserved online and 1 are first-come, first-served.
Where the open windows are
36.7% of tracked site-nights are not currently open for online reservation. 195 of 308 remain open; here is where they are.
Load status
Sep 18 – Oct 15, 2026Not open online36.7%
Open site-nights195 / 308
Reserved (of online inventory)63 / 258
Weekday openings131
Weekend openings64
Of the open site-nights on mapped sites, 131 fall on weekdays and 64 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Oct 2026October holds the most room. 125 of 165 site-nights are still open there.
Holiday windows
Sites open per night · of 11 sites| Window | Night | Sites open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open |
Labor Day: no online availability on any tracked night.
Best-availability sites
Most open site-nights · tracked window| Site | Open site-nights |
|---|---|
| 002 | 23 |
| 007 | 23 |
| 001 | 22 |
| 005 | 22 |
| 004 | 20 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
Next windows
As of Sep 18, 2026 snapshotNext open dateTue · Sep 22
Next open weekendFri · Sep 25
The next bookable night is Sep 22; the first open weekend starts Sep 25. Campsite Sniper can watch later dates for you.
Stays and site detail
195 open site-nights across 10 sites at Union Flat, from the same hourly snapshot as everything above.
Multi-night stays. 25 2-night, 24 3-night, 11 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 22 at site 001.
RV length. Longest recorded site here is 50 ft. 7 sites take 25 ft, 3 sites take 35 ft, 2 sites take 40 ft.
All 10 sites with current availability
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| 002 | 25 ft | None | 23 | 20 nights | Sep 22, Sep 23, Sep 24, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4 +11 more |
| 007 | 20 ft | None | 23 | 22 nights | Sep 22, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4 +11 more |
| 001 | 40 ft | None | 22 | 14 nights | Sep 22, Sep 23, Sep 24, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 2, Oct 3, Oct 4, Oct 5 +10 more |
| 005 | 50 ft | None | 22 | 19 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +10 more |
| 004 | 20 ft | None | 20 | 12 nights | Sep 22, Sep 23, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +8 more |
| 006 | 20 ft | None | 20 | 12 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +8 more |
| 011 | 36 ft | None | 20 | 12 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +8 more |
| 009 | 27 ft | None | 19 | 9 nights | Sep 22, Sep 23, Sep 24, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4 +7 more |
| 010 | 20 ft | None | 16 | 8 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 11 +4 more |
| 008 | 31 ft | None | 10 | 7 nights | Sep 22, Sep 23, Sep 24, Oct 9, Oct 10, Oct 11, Oct 12, Oct 13, Oct 14, Oct 15 |
About Union Flat
Overview
Union Flat Campground is located on the North Yuba River, near Highway 49. Visitors enjoy a wide variety of recreational activities in the area, including hiking, hunting, fishing, canoeing and gold panning.
Facilities
The campground offers several single-family campsites and one double site. Some sites are designated for tent camping only. Each site is equipped with a picnic table and campfire ring. Vault toilets are provided.
Natural Features
The campground stretches along the north bank of the North Yuba River. A tumbled rock wall from early gold dredging activity separates campsites from the river. A forest of pine, fir, maple and oak trees covers the area, offering shade in many sites.
Nearby Attractions
Union Flat Campground is located on the Yuba Donner Scenic Byway (Highway 49) near many gold rush era historical sites and old mining towns such as Goodyears Bar, Sierra City, and Downieville. Many points of interest lie along Highway 49 and are part of the 49 miles of Highway 49 driving tour; look for interpretive signs and other historical sites along this tour route. Gold Lakes Basin offers boating, fishing, biking, and hiking. Boating, fishing and swimming are available at nearby Sardine Lakes, about 14 miles east of the campground. Sardine Lakes Resort offers boat rentals, lodging, and a restaurant. On the water, visitors enjoy boating and fishing. Anglers will find rainbow and brook trout in many of the lakes, streams, and rivers throughout the basin. Over 30 miles of maintained trails for hiking, mountain biking, and motorcycle singletrack branch out across the area and the Pacific Crest Trail can be accessed at a few spots east of Sierra City and in the Gold Lakes Basin area. The historic towns of Sierra City and Downieville offer historic and cultural attractions, restaurants, shops, churches, and vistor information.
11 monitored sites1 FCFS siteRVs up to 50 ftNo hookups11 shadedWaterfrontRiverfrontPets OKFire pitsMax party 12
Getting there
From Downieville, take Highway 49 north about 6 miles. The campground is on the right side of the highway.
Yuba River Ranger Station, Nevada City, CA 95959(530)478-6253
BikingCampingFishingHuntingKayakingMountain BikingScenic DriveSwimming SiteWater AccessWater Activities
View on Recreation.gov ↗ Get directions ↗
03 · Field Photos · roll CS-234534 · facility + sites
Photo gallery
Roll CS-234534 · Union Flat · Nevada City CA12 frames · facility + sites
FAQ
How do I get a reservation at Union Flat?
Reservations for Union Flat are made through Recreation.gov. 195 of 308 tracked site-nights are currently open (63.3%). Campsite Sniper has also detected 6 site openings here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 16:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
How often do new openings appear at Union Flat?
Campsite Sniper detected 3 site-date openings at Union Flat in the last 7 days, 6 over 30 days and 6 over the last 90.
Can I get a multi-night stay at Union Flat?
24 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Sep 22 at site 001. Confirm and book on Recreation.gov.
Which sites at Union Flat fit a 35-foot RV?
3 of the 11 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 50 ft.
Which month has the most availability at Union Flat?
October 2026, with 125 open site-nights in the current snapshot of 165.
When is the next open date at Union Flat?
As of the Sep 18, 2026 snapshot: the next open date is Tue, Sep 22 and the next open weekend starts Fri, Sep 25. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
Stop refreshing. Let the app watch it.
Filter
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
Watch
We run paced availability checks for Union Flat. One watch covers every matching online-reservable site.
Get the ping
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.
Alerts monitor online-reservable inventory only; first-come, first-served sites are not included.