What's new
New features and improvements on the Rivers of Thailand map, with how to use them, newest first.
93 canals drawn whole, and coastal canals running into the sea
Stretches of some canals are mapped in OpenStreetMap as river, or left out where they pass under a road, so the map drew them in pieces. 93 canals are now drawn whole, such as Khlong Samrong, about 55 km from the Chao Phraya to the Bang Pakong, and canals that end at the coast, such as Khlong Dan at Bang Bo, now run into the Gulf of Thailand.
- Open the map and tap a canal
- See its length and the provinces it passes through in the panel
- Tap a gauging station on a canal for the way its water leaves for a river or the sea
Also improved
- There are two Khlong Dan: the one at Bang Bo runs into the Gulf of Thailand, the Thonburi one leads to the Tha Chin; each now has its own note
- All 79 named rivers checked: their lines on the map are whole
- Flooding seen from space uses only the days NASA has finished, so it no longer empties while a new day is being made
- The map data grew by only about 1%, so the map runs as smoothly as before
Flooding seen from NASA's satellites, on the map
The map shows flooded land across the country from NASA's VIIRS satellites, the last three days at a time: red is water on land that is usually dry, pink is land that floods most years. Read it with the gauges that are over their banks; the layer is on by default.
- Open the map: the flood layer is already on
- Zoom into the red
- Tap a gauging station nearby to see how far over the bank it is
Rain from NASA's satellites, Laos, Myanmar and Cambodia included
The rain layer can show either Thailand's rain gauges or a whole day's rain from NASA's GPM satellites, which covers the upper Mekong and Salween in the neighbouring countries where Thailand has no gauges. About two days behind.
- Open the layers button on the map
- Switch on Rain and choose NASA satellites
- Blue shows where it rained, deeper for more
Also improved
- The site keeps NASA's images for three hours rather than asking NASA every time, so the map opens faster
Tides at 28 stations around the coast
The map now has tide stations along the Gulf of Thailand and the Andaman coast: whether the tide is rising or falling, today's high and low waters, three days charted and the high-tide days in the next two weeks. Gauging stations and spots on the rivers near the sea show the next high water too.
- Look for the sea-blue diamonds along the coast
- Tap one for today's tides and three days charted
- See the high-tide days in the next two weeks
LINE: type Tides for high and low water
Type Tides in Meanam on LINE for the next high water at Bangkok and the river mouths, or add a station or seaside province, such as Tides Hua Hin. Sharing a location near the sea brings the nearest station's tides too.
- Add @982juknf
- Type Tides, or tap the Tides button
- Tap a station for the whole day's tides
Tides
Today's tides
Bangkok and the river mouths. Tap one for details.
Royal Thai Navy HQ
Next high water 12:10, +0.81 m
Bangkok Port
Next high water 11:10, +0.83 m
Phra Chulachomklao Fort
Next high water 10:10, +1.06 m
Tha Chin River mouth
Next high water 10:40, +1.02 m
Mae Klong River mouth
Next high water 10:10, +1.05 m
Bang Pakong River mouth
Next high water 10:10, +1.04 m
For somewhere else, type e.g. “tide Hua Hin”
Predictions from HII, from mean sea level. Wind, storms and river water are not included.
LINE: a dam's year against last year, charted
Type a dam's name in Meanam on LINE: under its share of capacity is this year's storage against last year's, with the normal storage and the rule curves, the same chart as on the dam's page.
- Add @982juknf
- Type a dam, such as Srinagarind
- See the chart under its share of capacity
Srinagarind
Srinagarind Dam
Khwae Yai River, Kanchanaburi
of capacity
In the reservoir
17,387 million m³
Capacity
17,745 million m³
Inflow
17.7 million m³/day
Released
20 million m³/day
Data for 14 Nov 2026 from HII (ThaiWater)
Also improved
- The site keeps a copy of the medium reservoirs for when ThaiWater is down
Try the reservoir: when a dam would fill at the inflow, release and rain you set
Every dam's page now has a reservoir simulator: set the inflow, the release and the rain over the catchment, and see when, over the next 90 days, the reservoir would reach normal storage, cross a rule curve or fall to dead storage, starting from today's real figures.
- Open a dam's page, or press Try the reservoir in its panel on the map
- Move the inflow, the release and the rain
- Read when it would fill or cross a curve in the box below
If the whole river rose by X cm, where would it go over the bank
Under the chart of water along a river, a slider raises every station by the same 10 to 200 cm. A dashed line shows the water after the rise, with how many stations would be over the bank and which ones newly.
- Click a river on the map
- Move If the whole river rose by, under the chart
- Read how many stations would be over the bank, and which
When water from here reaches the towns down the river
Click a spot on a river, a station or a dam: under the route to the sea are the towns the water passes, the distance along the rivers and roughly when it would reach each; from a dam, for what it releases.
- Click a river, a station or a dam on the map
- Scroll to the route to the sea
- Read the rough time to each town
Also improved
- The stats page lists only the dams, reservoirs, provinces and rivers people ask LINE about
- Dam figures stay up even when ThaiWater's main feed is slow
Click a river or a dam on the map for its water chart
Click a river on the map and its panel charts the water at every gauging station along it, from upstream down, against the bank, with the last two days at the station nearest where you clicked. A dam's panel charts its storage this year against last.
- Click a river on the map, or pick one from the list
- Tap the chart to pick a station and see its last two days
- Click a dam for its storage this year against last
Nearly 500 medium-sized reservoirs
The dams page now lists the water in the medium-sized reservoirs, and the small ones with automatic gauges, that have reported in the last few days. Search by reservoir, district or province, filter by region or level, and sort by share of capacity or water stored.
- Open Dam storage
- Scroll to Medium-sized reservoirs
- Type a reservoir, district or province, or pick a level
Water quality: salinity and oxygen
The water levels page now shows the latest salinity and dissolved oxygen from the Pollution Control Department's and the Metropolitan Waterworks Authority's monitoring stations, saltiest first. The dots show where the water starts to matter for tap water, farming or fish.
- Open Water levels today
- Scroll to Water quality
- Read the dots: green is fine, amber starts to matter, red needs care
LINE: full dams and reservoirs, and reservoirs by name
Type Full in Meanam on LINE for the large dams and reservoirs at or over capacity, type a medium reservoir's name for the water in it, and the dams list now always puts the full ones first.
- Add @982juknf
- Type Full, or tap the Full button
- Type a reservoir, such as Huai Lat Kao
Full
Full dams and reservoirs
Storage at or above 100% of capacity; tap one for details
Large dams
Nong Pla Lai Reservoir
Pasak Jolasid Dam
Thap Salao Dam
Bang Phra Reservoir
Mae Ngat Somboon Chon Dam
Medium and small reservoirs
of 495 reporting
Huai Lat Kao Reservoir
Na Wang District, Nong Bua Lam Phu
อ่างเก็บน้ำวังร่มเกล้า
Mueang Uthai Thani District, Uthai Thani
อ่างเก็บน้ำลำเชียงไกรตอนล่าง
Non Thai District, Nakhon Ratchasima
Huai Tung Khop Reservoir
Mueang Phayao District, Phayao
อ่างเก็บน้ำวังปลาหมอ
Khao Saming District, Trat
อ่างเก็บน้ำคลองหลวง รัชชโลทร
Ko Chan District, Chon Buri
Huai Yoi Reservoir
Nong Muang Khai District, Phrae
อ่างเก็บน้ำอำปึล
Mueang Surin District, Surin
อ่างเก็บน้ำลำคันฉู
Bamnet Narong District, Chaiyaphum
อ่างเก็บน้ำคลองศาลทราย
Khao Khitchakut District, Chanthaburi
Data for 15 Nov 2026 from HII (ThaiWater)
Find any gauging station, with its trend
The water levels page now finds any of the 800-plus gauging stations by its name, river, district or province, and every station on the page opens its last two days of water level and which way the water is going. The top of the page charts the stations where the water is highest against the bank.
- Open Water levels today
- Type a station, river, district or province in the search box
- Press Trend at the end of a row for the last two days
Dams: search, filter, sort and storage trends
Today's reservoir table can now be searched by dam or province, filtered by region or storage level and sorted by any column. Every dam shows its last 30 days and how much its storage changed in 7, and each dam's page charts the year so far against last year.
- Open Dam storage
- Search, pick a region or level, or press a heading to sort
- Press a dam's name for this year against last
Main roads on the map
Switch on main roads to see which road a river, canal or gauging station lies near. Highways show from the whole-country view and smaller roads as you zoom in, with route numbers; the roads sit in light tones beneath the water, which stays the clearest thing on the map.
- Open the map settings (layers)
- Switch on Main roads
- Zoom in for smaller roads and route numbers
Also improved
- Dam pages now show usable water, with the largest capacity and dead storage from the Royal Irrigation Department
- Tha Thung Na Dam now has its daily storage
- Clicking a small stream with no name lists the three nearest gauging stations
- The first time the map opens, it introduces Meanam on LINE for real-time water updates
- A note by the map settings shows where to switch on roads, rain and province lines
- The latest figure on the water level charts now takes the line's colour
Two-day water level charts and trends
Tap a gauging station to see its last two days of water level against the bank, how fast it is rising or falling, and when it would reach or drop below the bank at that rate. Dams show how many days until full at today's inflow and release, and a new stats page gathers the charts for the places people follow most.
- Tap a gauging station on the map
- Scroll to Water level, last 2 days
- Open Stats for the places people follow most
Rain on the map, over 24 hours and the last hour
See where it rained, from more than 4,300 rain gauges across the country: the total over 24 hours, or the last hour, which is close to the rain falling now. See too how much fell on average above a dam or any point on a river, with the volume of rain that makes.
- Open the layers button on the map
- Switch on Rain and choose 24-hour total or Last hour: blue shows where it rained, deeper for more
- Tap a dam or a river to see the rain above it
Full reservoirs in red
Tap a dam and today's storage comes first. Reservoirs at 100% of normal storage or more turn red, and those at 30% or less turn amber, on the map, the dam pages and in LINE.
- Tap a dam on the map
- Read the figure and the bar at the top of the panel
Meanam on LINE
Ask about water levels, dam storage and where rivers flow in a LINE chat. New friends get a welcome card, a loading sign shows while the answer is on its way, and the dams list runs from fullest to emptiest.
- Add @982juknf
- Type Dams, or a dam, province or river
- Share your location to see stations near you
Dams
Large dams today
Tap a dam for details
Nong Pla Lai Reservoir
Pasak Jolasid Dam
Thap Salao Dam
Bang Phra Reservoir
Mae Ngat Somboon Chon Dam
Srinagarind Dam
Vajiralongkorn Dam
Sirikit Dam
Ratchaprapha Dam
Bhumibol Dam
Ubol Ratana Dam
116 of 495 medium and small reservoirs are full
Tap to see which
Data for 14 Nov 2026 from HII (ThaiWater)
Also improved
- On phones, LINE has its own button at the top right and the menu fits on one line
- Figures on the site now refresh within 10 minutes, the same as in LINE
- Pages load faster when many people visit at once
Share a place with its own preview
Every river, dam, station and point on a river has its own link. Shared to LINE or Facebook, it shows a preview of that place with today's figures.
- Pick a river, dam or station on the map
- Press the share button at the top of the panel
- Choose LINE, Facebook, X or copy the link
Near me
See the nearest waterway and where its water goes, with the five nearest gauging stations and three nearest dams. Your location stays in your browser.
- Press the location button on the map
- Allow the browser to use your location
- Read what is near you in the panel
Guides to rivers, dams, canals and today's levels
Read about 79 rivers, 46 dams and the main canals, with tables, small maps and common questions. On phones the menu is a single row of tabs.
- Pick rivers, dams, canals or levels from the menu
- Tap a name in a table for its own page
The 3D map of Thailand's rivers
The whole river network flowing from the mountains to the sea, water levels from over 800 telemetry stations and dam storage, in Thai and English.
- Click any river to see its way to the sea
- Press follow the water to fly along it
- Switch language with TH/EN
Also improved
- Canal water is traced along connected canals to a river or the sea
- Stations, dams and towns sit at their true positions