About GrachtAlert
Routes, water level & incident reporting for skippers on the Amsterdam canals
GrachtAlert started as a reporting point: skippers on the Amsterdam canals regularly face objects being thrown, obstacles in the water and dangerous situations on the water — causing material damage and putting skippers and passengers at risk.
By now GrachtAlert does much more: besides reporting nuisance and incidents, the app also offers a route planner that accounts for your boat’s dimensions, bridge clearances and current closures, and the live water level of the Amsterdam canals.
Reports are still automatically forwarded to the City of Amsterdam. The collected data helps make the severity of the problem visible to the city, police and media.
The initiative was started by skipper Darcey and is fully independent. The more skippers take part, the stronger the signal.
Contact
Question, tip or comment? Send a message.
Stay informed
Get notified the moment an incident on the canals is reported.
A text message on your phone for every report
Only for GrachtAlert alerts. Never shared.
App on your home screen
No download required — add GrachtAlert as an app for quick access.
- 1Tap the share button at the bottom of Safari
- 2Scroll down and tap "Add to Home Screen"
- 3Tap "Add" in the top right
- 1Tap the three dots at the top right in Chrome
- 2Tap "Add to Home screen"
- 3Tap "Add" to confirm
Data security
GrachtAlert stores public incident data (location, type, time) strictly separated from private contact data (name, boat, operator). Contact details are never publicly visible.
- ✓Reports are stored encrypted via Supabase (EU data centre)
- ✓Personal details are never made public
- ✓Only authorised parties have access to the full data
- ✓Data is never sold to third parties
Het Parool
“Skippers pelted weekly with water balloons and eggs: ‘This is downright life-threatening’”
Read the article (Dutch)
RTL Nieuws
“Police warn of new water-balloon prank trend”
Read the article (Dutch)
RTL Nieuws
“Boy pushed off bridge in Amsterdam, injured after landing on canal cruise boat”
Read the article (Dutch)
Omroep West
“Woman injured after youths throw watermelon off bridge: ‘It’s getting completely out of hand’”
Read the article (Dutch)