Bridges and Viaducts in Norway — 59 Listed by Length

• 59entries listed
• 1.89 kmlongest bore
• 1955–2017openings span
• 51.06 kmtotal length

The record table

How this archive measures: lengths, bores, dates and ordering

How this table is compiled

Where one of these 58 lengths disagrees with an operator's own figure for Norway, the table keeps the published value and notes the difference instead of averaging the two. The 58 rows for Norway are ordered by length, not by date, so the 2017 opening sits well down the table without being any less current.

Lengths for Norway are recorded in metres which is how the operators publish them and why the shortest entry here reads as 522 m and not a rounded figure. The longest entry is 3.6 times the shortest and 2.5 times the median, which is the quickest measure of how uneven the table is.

A new scheme in Norway would have to beat 1.89 km to change the head of this table, and that is the figure worth rechecking when one opens. Eighth on the list is Gjemnes at 1.26 km, which is where the table stops being about record holders and starts being about ordinary infrastructure.

This page records the bridges and viaducts catalogued for Norway in a tunnel almanac maintained at this address since the late 1990s. Laid end to end the entries on this page would run 51.06 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.

The ten longest average 1.44 km against 0.76 km for everything below them, and that ratio is the clearest thing this table says about the distribution. The viaduct column names 58 distinct entries on this page, Drammen and Nordhordland among them, each traceable to the operator or administration record it was taken from.

Reading the figures

Dated entries run from 1955 to 2017, and the busiest decade is the 1970s with 15 recorded openings. Read down the longest span column, the 54 values run from 46 m to 1 310 m with a midpoint at 203 m; the spread rather than the maximum is what says how uneven this set is.

Roughly 11 of the dated entries opened in this century, which is a rough measure of how much of the network is recent. Read down the clearance column, the 44 values run from 6 to 62 with a midpoint at 36; the spread rather than the maximum is what says how uneven this set is.

The longest stands 0.28 km clear of the next longest, which is the margin to watch when a new scheme is announced. Read down the fylke column, the 58 values run from 1 to 20 with a midpoint at 15; the spread rather than the maximum is what says how uneven this set is.

37 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. The date of opening column runs from 7 to 19752006 across 47 dated rows, and the 1970s alone account for 14 of them, so the building effort here came in waves rather than evenly.

The dated entries carry 38 distinct opening years across 62 years, and the median opening year is 1985. The material on this page is held in 7 captions rather than in running text, 46 words of it, each written against the image or row it belongs to by the compiler who put the page together.