Tømmerrenna: Norway’s Longest Timber Slide

A Ride Through Time

Tømmerrenna stretches approximately 4 km from Steinsfossen to Beihølen. That makes it the longest timber slide of its kind in Norway. And now you can take a hike in it – without getting your feet wet.

Originally constructed between 1952 and 1957, it served as an ingenious solution to the timber-floating challenges caused by hydroelectric development. A dam had left parts of the Otra River too low for traditional log transport.

Engineered by Sigurd Aas, as his diploma thesis at NTH (now NTNU), the structure features steel pylons made from repurposed Setesdalsbanen rails. It also contains two suspension bridges (100 m and 120 m) and tunnels spanning 100 m.

When the river dried up seasonally, the timber slide was vital—yet timber transport continued only until the late 1970s. That’s when trucks and roads became the main alternative. In 1984, the structure was preserved as a heritage site and entrusted to a foundation.

A Trail Elevated—Perfect for Riders & Explorers

Today, Tømmerrenna is one of Southern Norway’s top tourist draws, luring over 60,000 visitors annually for scenic hikes through a natural canopy, submerged views of forest life, and the thrill of walking above the river.

Hikers will encounter suspension bridges, tunnels, panoramic views of forests and rapids, remnants of the Kringsjå power station. The slide runs partly next to the historic Setesdalsbanen—a steam heritage railway that often rumbles alongside. Many hikers even enjoy a break at Paulen gård, now maintained by local scouts with a rustic camp vibe.
The whole hike is a mellow, accessible walk that takes about 2 hours round-trip and suits all ages.

Care and Conservation

Despite its popularity, Tømmerrenna has faced wear. Reports in 2023 highlighted decaying planks and holes, triggering renovations. By late 2024, restoration began, carefully retaining its authentic, weathered look—starting with the first 40 meters and continuing toward Steinsfossen, including upgrades to the iconic hengebroer (suspension bridges).

Getting There & Practical Info

• Location: Start at Steinsfossen, about a 30-minute drive from Kristiansand. You can also reach Grovane by public transit via bus 31 and Setesdalsbanen.
• Parking: Day parking costs NOK 150, short-term under 3 hours NOK 75—fees are voluntary and fund maintenance.
• Safety Note: Walk at your own risk. The trail runs closely alongside active railway tracks—stay vigilant.

YouTube video by Pedro Cristóvão