Tag:waterway=dam

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Public-images-osm logo.svg waterway = dam
Amagase Dam.jpg
Description
A wall built across a river or stream to block and regulate the flow of the river Edit
Group: Waterways
Used on these elements
should not be used on nodesmay be used on waysmay be used on areasshould not be used on relations
Useful combination
Wikidata
Status: approvedPage for proposal

A wall built across a river or stream to impound the water. A dam normally does not have water flowing over the top of it.

Sometimes there is a waterway=fish_pass around it.

How to Map

  1. Smaller dams can be drawn as a way way and tagged with waterway=dam.
  2. Bigger dams can be drawn as an area area and tagged with waterway=dam + name=*.

Validators and QA tools generally want that the waterway=river have shared node(s) with the waterway=dam if and where they cross it (flow through it). If the river runs in a tunnel well underneath the dam it should be mapped as waterway=river + tunnel=yes + layer=-1 without any shared nodes with the dam.

Example

small dam as a way way
big dam as an area area

The artificial lake created by the water impounded behind the dam wall (commonly called a 'dam' in Australia) should be tagged as natural=water + water=reservoir or water=pond as appropriate.

(High-)ways over a dam

This subject was not part of the proposal but the most straightforward solution is that the highway=* and waterway=dam share a way.

Validators and QA tools may complain about this combination because many have an overly generic rule saying that highways and waterways can not share a single way - this is one of the valid exceptions and tools should be fixed to accept it.

Related tags