Storage dam
Pasak Jolasid Dam
เขื่อนป่าสักชลสิทธิ์
Pasak Jolasid Dam is a storage dam on the Pa Sak River in Phatthana Nikhom District, Lopburi province. Its reservoir holds 960 million m³. It was completed in 1999 and is run by the Royal Irrigation Department. Built under a royal initiative to relieve flooding in the lower Chao Phraya basin.
Reservoir storage today
102.8% of capacity at normal storage level
- Water in the reservoir
- 896 million m³
- Usable water
- 882 million m³ (92.1% of usable capacity)
- Inflow
- 14.1 million m³ a day
- Released
- 0.4 million m³ a day
As of 14 Nov 2026 Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes
Storage this year and last
Up 72.1 million m³ over the last 7 days
25.3 million m³ less than on the same day last year
- 2026
- 2025
- Normal storage 872 million m³
- Upper and lower rule curves
Daily storage from the National Hydroinformatics Data Center (ThaiWater). The rule curves are the range the dam is meant to be kept within through the year.
Try the reservoir
Change the inflow, the release and the rain over the dam's catchment, and see what the reservoir would do over the next 90 days, starting from today's figures.
The reservoir would rise by 13.7 million m³ a day
- Reaches its largest capacity: water would go over the spillway in 11 days (25 Nov 2026)
In 90 days it would hold about 1,036 million m³ (118.8% of capacity)
- Actual storage
- Projected
- Normal storage
- Upper and lower rule curves
- Dead storage
Today's storage, plus the inflow and the rain that runs in, less the release, a day at a time; evaporation and seepage are left out. It is arithmetic on the figures you set, not a forecast.
Key facts
- River
- Pa Sak River
- Location
- Phatthana Nikhom District, Lopburi province
- Coordinates
- 14.8614, 101.0661
- Reservoir capacity
- 960 million m³
- Maximum capacity
- 1,036 million m³
- Dead storage
- 14.6 million m³
- Dam height
- 37 m
- Dam type
- Earthfill dam
- Completed or opened
- 1999
- Operator
- Royal Irrigation Department
Maximum capacity and dead storage from the Royal Irrigation Department
Frequently asked questions
- Where is Pasak Jolasid Dam?
- Pasak Jolasid Dam is in Phatthana Nikhom District, Lopburi province.
- What is the water level of Pasak Jolasid Dam today?
- Pasak Jolasid Dam is 102.8% full, holding 896 million m³, as of 14 Nov 2026.
- How much water can Pasak Jolasid Dam hold?
- The reservoir of Pasak Jolasid Dam holds 960 million m³.
- When was Pasak Jolasid Dam built?
- Pasak Jolasid Dam was completed and opened in 1999.
- Who runs Pasak Jolasid Dam?
- Pasak Jolasid Dam is run by the Royal Irrigation Department.
- What is the Pasak Jolasid Dam called in Thai?
- In Thai the Pasak Jolasid Dam is เขื่อนป่าสักชลสิทธิ์.