| Bolstadfjorden | |
| Location: | Vestland county, Norway |
| Pushpin Map: | Vestland#Norway |
| Pushpin Label: | Bolstadfjorden |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location of the fjord |
| Basin Countries: | Norway |
| Coords: | 60.6167°N 55°W |
| Type: | Fjord |
Bolstadfjorden is a long fjord in Vaksdal and Voss municipalities in Vestland county, Norway. The Bolstadfjorden is a branch of Veafjorden and a continuation of Vikafjorden. Vikafjorden meets Bolstadstraumen at Straume and the mouth of Bolstadfjorden. It is the innermost point of the fjord system surrounding the city of Bergen.[1]
Bolstadfjorden is deep with a threshold of only which creates a strong tidal current. Bolstadfjorden has a surface area of . There is a threshold at creating two basins, the outer . The Vosso River flows into Bolstadfjorden and brings freshwater from a catchment area. Freshwater inflow peaks in May to June. Freshwater or brackish water on the surface obstructs circulation of the heavier saltwater leaving the saltwater in the deeper part deprived of oxygen. Measurements in April and August 2006 indicated that there was no oxygen at or deeper. In April the layer of brackish water was about deep, while in August the brackish water was deep.[2] [3] [4]
The main road from Bergen-Voss-Oslo (European route E16) runs along the south shores of the fjord. The Voss Line originally ran along the south shore, partly through 10 short tunnels. When the Bergen Line in 1987 was shifted deeper into the bedrock (through the 8km (05miles) long Trollkona tunnel), the E16 highway partly took over abandoned tunnels and rail tracks along Bolstadfjorden.[5]