The Manuherikia River flows through Central Otago on New Zealand's South Island, with its most notable paddling section being the Ophir Gorge. This gorge contains grade 3 and 4 whitewater rapids, making it a technically demanding run suited to experienced paddlers. It is considered a rare and valuable resource in the region, as comparable whitewater runs in Otago tend to be located in far more remote and difficult-to-access areas. The Kawarau River is noted as a nearby alternative with consistently higher volume.

Water levels are a significant planning consideration. The river is officially classified as a stressed waterway and shrinks considerably during summer as irrigation demands increase downstream. Paddlers have noted that flow is frequently insufficient, and the technical nature of the river means adequate water is essential for a safe and worthwhile run. The river is also subject to periodic flooding and heavy silting.

Access to the Ophir Gorge is possible below the major rapids at Chinky Gully, reached through private property. The cooperation of landowners is generally required, and access along the river corridor is limited — the gorge sections in particular are difficult to reach except where roads intersect the river. Keddell Road is noted as an access point for kayakers. Dense growth of broom, briar, and willow along the banks further complicates longitudinal movement along the river.

The gorge itself is described as scenic, and relatively few people are aware of it despite its proximity to the Central Otago road network. Jet boating also takes place on the river, which paddlers should be aware of when planning trips. The broader river corridor supports brown and rainbow trout, wading birds, and waterfowl, and the river has a long history of use by gold miners, farmers, and irrigators in the region.