Near the Sunriver Nature Center and Observatory, River Road narrows to one lane and a temporary signal decides when your side gets to go. Central Oregon Daily reported that drivers in that work zone can wait up to 10 minutes. Below the road, the pathway that used to carry walkers and cyclists under River Road has been closed since Monday, Aug. 31. The lane restriction started on Sept. 8.
For most people who live in Sunriver or come down often, the real question is how long this lasts. The answer has already changed once, and last year's tunnel project shows why it could change again.
The finish date has already moved a month
On July 18, 2026, the Sunriver Owners Association's monthly board report said "All River Road tunnel hurdles have been cleared and contracts are in place." It also said the project was "set to start in September and be completed by the end of October."
Five weeks later, Central Oregon Daily's Aug. 25 report gave different dates. The pathway would close Aug. 31, River Road would drop to one lane Sept. 8, and the project was "expected to be finished by late November." So the pathway closed a day before the September start the board had expected, and the finish moved back about a month.
Late November is the most recent public estimate we could find as of early October. SROA's tunnel replacement page still just says "Fall 2026," with no progress updates. The safest way to read late November is as a forecast, not a promise.
Why Sunriver is doing this one tunnel at a time
The River Road job is one piece of a longer plan. SROA says Sunriver's original tunnels were built between the late 1960s and the 1980s from corrugated metal. They are narrow enough that only one direction of traffic fits at a time. The new concrete tunnels are wider and carry two-way bike and pedestrian traffic.
Starting in 2019, SROA planned to replace one tunnel a year "barring any construction complications" until all 13 were done. The money comes from the association's capital replacement reserve fund. Here is SROA's own list so far:
| Year | Tunnel |
|---|---|
| 2019 | West Cascade Road near Circle 4 Ranch Cabins |
| 2020 | Abbot Drive south of the Village, a new tunnel built with the Abbot/Beaver Drive intersection project |
| 2022 | Fort Rock Park |
| 2023 | Abbot Drive north of Circle 1 |
| 2025 | Wildflower Tunnel on Abbot Drive near Circle 2 |
| Fall 2026 | River Road |
| 2027 | Circle 3 |
There is no entry for 2021 or 2024. The one-a-year plan has held most years but not every year, and the schedule has always come with the warning about construction complications.
Wildflower hit underground delays in 2025 too
The tunnel before this one is the best guide to how River Road may go. On May 16, 2025, Public Works Director Mark Smith told the SROA board the Wildflower tunnel was scheduled to open June 15. At that point the job was already running behind. The May board report described it as challenging and said crews had found more utilities underground, which caused another delay. The contractor was adding resources to try to finish by or before June 15.
By the July 19, 2025 board meeting, SROA's communications record listed a "New Tunnel Open" e-blast and a social media post about the new tunnel opening. The public records we found don't give the exact opening date. They do show that a firm target was set while the crew was still running into utilities it hadn't expected underground, and that the job needed extra resources to try to stay on schedule.
That is the pattern to keep in mind for River Road. Replacing a tunnel means digging up a road that has been in place for decades, and nobody fully knows what is down there until the excavation starts.
Why River Road costs more than the others
River Road was expected to be harder than most before work began. SROA General Manager James Lewis told the board this tunnel would cost about $100,000 more than other replacements because of the soil conditions and the additional work they require.
SROA's proposed 2026 budget presentation, dated Nov. 14, 2025, included $614,000 for "Tunnel Replacement (River Road)" among its reserve replacement items. That was a proposed budget line, not a final contract price, and we did not find a published contractor name or final contract amount. Still, the soil premium and the budget figure point the same way. The association planned for this site to be harder than the earlier ones, and that planning came before anyone dug.
Put the July target, the Aug. 25 revision, the Wildflower delays and the soil premium together, and late November is a reasonable estimate that could still move.
Planning around the signal this fall
For the next several weeks, the one-lane section and the closed pathway sit right next to one of Sunriver's busiest year-round destinations. Central Oregon Daily described the work zone as near the Sunriver Nature Center and Observatory. A few details help if you're headed that way:
- Daytime nature center visits. The Sunriver Nature Center & Oregon Observatory's fall hours are Wednesday through Saturday, 10 a.m. to 3 p.m. It's closed Sunday through Tuesday.
- Evening observatory programs. Public observatory nights run on Wednesdays and Saturdays year-round, with extra Thursdays and Sundays during peak periods. All nighttime visits need a reservation. With a reserved time and a signal that can hold traffic for up to 10 minutes, it's worth leaving a little earlier.
- Walking and biking. The pathway under River Road is closed to pedestrians and cyclists for the duration of the work. We didn't find an official detour route published in text, and the closure map that ran with the news report couldn't be retrieved. SROA Public Works answers tunnel questions at 541-593-2483.
- Closure notices elsewhere. SROA's road and pathway work page says pathway seal-coating and paving usually happen in spring and early fall, and it asks pathway users to follow posted closure and detour signs.
The Sunriver Police Department said the project is needed to replace the aging tunnel. The current crossing is one of the original corrugated tunnels that carries one direction of traffic at a time. The replacement will be wide enough for two-way traffic.
The rest of the pathway system this year
River Road is the only major pathway disruption we found scheduled for this fall. Much of this year's surface work is already done. SROA's July report said six miles of pathways were sealed in June, and slurry sealing was finished on 30 roads totaling 540,000 square feet.
The next big pathway project is still on paper. SROA's capital work plan lists the 2026 phase of the Circle 2–3 pathway as design, survey, engineering and easements, not construction. The broader Pathway Master Plan, adopted in March 2022, says plainly that its concepts have no implementation timeline. The lines on that map are ideas, not scheduled work.
The firmest date on SROA's list after River Road is 2027, when the Circle 3 tunnel is up next.
If you own in Sunriver from out of town, or you're the trustee or family member keeping an eye on a Sunriver home for someone else, a fall project like this is one of those local details that's easy to miss from far away. Jan Davey has lived in Central Oregon since 1992 and keeps track of what's happening on the ground for clients who can't be here. If you'd like a calm, local read on a Sunriver property this fall, let's connect.
