Why does a pathway tunnel that engineers rated in middling condition take a full fall of single-lane traffic, temporary signals and a closed walking route to replace?
SROA's own 2021 evaluation gave the River Road tunnel a 3 out of 5 for condition, the same score as tunnels that sit under quiet stretches with easy detours. What sets River Road apart is the road above it. Sunriver's tunnel program swaps narrow, one-way tunnels from the community's early decades for wider ones, and River Road is about the hardest place in Sunriver to do that work without disrupting traffic.
What changed on River Road this fall
The Sunriver Owners Association laid out the schedule in an August 24, 2026 bulletin. Work on the River Road Tunnel Replacement Project started near Lake Aspen on August 31. That day the pathway through the tunnel closed to walkers and cyclists and a signed detour went up. On September 8, River Road dropped to a single lane through the work zone. Temporary traffic signals now direct cars through, and SROA said to expect delays of up to 10 minutes during peak construction periods.
The bulletin also covered the Sunriver Nature Center & Observatory, which is easy to miss. Because of the pathway closure, the Nature Center can be reached only by car using the detours, and all pedestrian access stays closed during construction. If you usually walk or bike to the Nature Center, you'll need to drive until the work is done. SROA linked a "Pathway Navigation" map from the bulletin to help pathway users find their way around the closure.
Central Oregon Daily reported the same dates and the same late-November target. It said the Sunriver Police Department described the project as necessary to replace the aging tunnel.
The tunnel wasn't the problem. Its location was.
In March 2021, SROA commissioned an evaluation of the remaining pathway tunnels. SROA's website files it as the "2022 Pathway Tunnel Evaluation Report," but the cover is dated March 2021. Each site was scored from 1, "No Issue," to 5, "Severe Issue," on eleven criteria. Those included emergency vehicle access, detour availability for cars and for bikes and walkers, crane access, utility conflicts, flooding, and the condition of the tunnel itself.
Here is how River Road scored, next to a few other tunnels in the same report:
| Tunnel | Emergency vehicle access | Vehicle detour availability | Tunnel condition |
|---|---|---|---|
| River Rd. Tunnel | 5 | 5 | 3 |
| Lodge Tunnels | 5 | 5 | 2 |
| Circle 3 Tunnel | 3 | 3 | 2 |
| Beaver Dr. Tunnel | 1 | 1 | 3 |
| Theater Tunnel | 1 | 1 | 3 |
River Road's condition score is a 3, "Moderate Issue." That matches the Beaver Drive and Theater tunnels, which scored a 1 on emergency access and detours. River Road got a 5 on both. The tunnel is in about the same shape as several others. The road above it is far harder to work around. That is why the job runs as a single-lane, signal-controlled work zone, with cars still moving through, while the closed pathway sends walkers and cyclists onto a detour.
The same report ranks the worst flooding spots, and River Road isn't one of them. The Wildflower Tunnel was called the "Worst location for flooding." Fort Rock was the "2nd worst." Both have since been replaced, Fort Rock in 2022 and Wildflower in 2025.
Thirteen tunnels, one a year
According to SROA's tunnel program page, Sunriver's original corrugated tunnels went in as the community was built, from the late 1960s through the 1980s. They are narrow enough that only one direction of traffic fits through at a time. The replacements are concrete and wide enough for bikes and pedestrians to pass in both directions. Starting in 2019, SROA planned to replace one tunnel per year, barring construction complications, until all 13 are done. The work is paid for from the association's capital replacement reserve fund.
The program page lists what has been finished so far and what's coming:
- West Cascade Road near Circle 4 Ranch Cabins, 2019
- Abbot Drive south of the Village, a new tunnel built with the Abbot/Beaver Drive intersection improvements, 2020
- Fort Rock Park, 2022
- Abbot Drive north of Circle 1, 2023
- Wildflower Tunnel on Abbot Drive near Circle 2, 2025
- River Road, fall 2026
- Circle 3, 2027
River Road was picked a while ago. Minutes from the Sunriver Service District dated June 19, 2025, record that the tunnel between Circle 2 and the Village had been completed and that River Road was being considered as the next one. In a budget presentation dated November 14, 2025, SROA set aside $614K for "Tunnel Replacement (River Road)" in its FY2026 budget.
The finish line has already moved once
A Public Works update in the SROA board report dated July 18, 2026, said contracts were in place and expected the River Road work to wrap up by the end of October. By the August 24 bulletin, the target had moved to the end of November, "weather permitting." As of October 11, nothing published says the work is finished or that the November date has changed again. Plan around single-lane traffic on River Road for several more weeks. In late fall in Central Oregon, "weather permitting" carries real weight.
The Nature Center is keeping its regular fall schedule during construction. According to SNCO's hours page, fall hours began September 7: Wednesday through Saturday, 10 a.m. to 3 p.m., closed Sunday through Tuesday. Admission is $9 for adults, $7 for seniors, $6 for ages 4 to 17, and free for children under 4 and SNCO members. Some other listings still show Tuesday hours, so SNCO's own page is the one to trust. Public nighttime observatory visits run Wednesdays and Saturdays year-round, private star parties are offered Tuesdays and Fridays, and every nighttime visit needs a reservation. For now, a stargazing night there means driving in through the detour.
Circle 3 is next, and a bigger tunnel is in design
The Circle 3 tunnel is next on the list, scheduled for 2027. Its 2021 scores suggest a less disruptive job than River Road. It rated 3 for both emergency access and vehicle detours, and 2, "Slight Issue," for tunnel condition. Its highest scores, both 4, were for bike and pedestrian detour availability and utility conflicts.
A separate project nearby is larger and has been talked about much longer. At a special meeting on September 17, 2025, SROA Public Works Director Mark Smith told the board that a pathway between Circles 2 and 3 had been under discussion since 1987, held up mostly by land ownership. Plans call for replacing the current golf cart tunnel under Abbot Drive near Circle 2 with a 24-foot-wide tunnel shared by golf carts and pedestrians. The goal is to have engineered plans done by the end of 2026, with construction hoped for in 2027. Smith said the project addresses a gap left when SHARC was built, because no pedestrian routes to it were planned at the time. Design, survey, engineering and easements were estimated at $40K.
SROA hasn't published a schedule beyond 2027. The 2021 evaluation does name the Lodge Tunnels, and they match River Road's 5s for emergency access and vehicle detours. No year has been set for them. Based on those scores, whenever they come up they're likely to need the same kind of traffic control River Road has this fall. For questions about a specific project, SROA directs owners to Public Works at 541-593-2483.
Mike and Kim Riley are based in Sunriver and follow SROA projects like this one closely. If you're curious how SROA's reserve-funded projects like the tunnel program might shape where you spend your time in Sunriver, or how they come into play when you buy or sell a home here, the team at Bend Homes and Land is happy to talk it through. Contact Us anytime.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
