Basin Pa Sak
Pa Sak River
แม่น้ำป่าสัก
Rises in the Phetchabun Mountains in Loei province. It flows south through Phetchabun, Lopburi and Saraburi to join the Chao Phraya River at Ayutthaya. It has the Pasak Jolasid Dam and the Rama VI Dam.
Key facts
- Length
- about 735 kmMeasured along the river on this map; official figures can differ with the method used
- Source
- Loei province
- Flows into
- Chao Phraya River, Phra Nakhon Si Ayutthaya province
- Basin
- Pa Sak
- Provinces (5)
- Loei, Phetchabun, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya
- Tributaries on the map
- Lop Buri River
- Dams on the river
- Pasak Jolasid DamRama VI Dam
Pa Sak River water level today
15 automatic gauging stations on this river, highest water relative to the bank first. As of 15 Nov 2026, 05:20
| Station | Location | Level (m MSL) | Of bank-full | Status | Measured |
|---|---|---|---|---|---|
| สะพานปรีดี-ธำรง | Phra Nakhon Si Ayutthaya District, Phra Nakhon Si Ayutthaya | 1.97 | 79% | High | 15 Nov 2026, 04:00 |
| Pa Sak 9 | Nakhon Luang District, Phra Nakhon Si Ayutthaya | 1.66 | 76% | High | 15 Nov 2026, 05:20 |
| Pa Sak 3 | Nong Phai District, Phetchabun | 91.85 | 68% | Normal | 15 Nov 2026, 05:20 |
| Pa Sak 8 | Tha Ruea District, Phra Nakhon Si Ayutthaya | 2.13 | 65% | Normal | 15 Nov 2026, 05:20 |
| ท้ายเขื่อนพระรามหก | Tha Ruea District, Phra Nakhon Si Ayutthaya | 2.50 | 61% | Normal | 15 Nov 2026, 04:00 |
| สถานีแพดับเพลิง | Mueang Saraburi District, Saraburi | 7.83 | 57% | Normal | 15 Nov 2026, 04:00 |
| Pa Sak 2 | Mueang Phetchabun District, Phetchabun | 112.39 | 44% | Normal | 15 Nov 2026, 05:20 |
| บ้านพูลทรัพย์ | Chai Badan District, Lop Buri | 43.33 | 43% | Normal | 15 Nov 2026, 04:00 |
| Pa Sak 1 | Lom Sak District, Phetchabun | 140.79 | 36% | Normal | 15 Nov 2026, 05:20 |
| บ้านบ่อวัง | Wichian Buri District, Phetchabun | 57.26 | 32% | Normal | 15 Nov 2026, 03:00 |
| ต.ตาลเดี่ยว | Lom Sak District, Phetchabun | 141.14 | 32% | Normal | 15 Nov 2026, 03:00 |
| ต.ในเมือง | Mueang Phetchabun District, Phetchabun | 111.08 | 27% | Low | 15 Nov 2026, 03:00 |
| บ้านป่า | Kaeng Khoi District, Saraburi | 8.89 | 24% | Low | 15 Nov 2026, 04:00 |
| ต.ตาดกลอย | Lom Kao District, Phetchabun | 192.72 | 22% | Low | 15 Nov 2026, 03:00 |
| ท้ายเขื่อนป่าสักชลสิทธิ์ | Phatthana Nikom District, Lop Buri | 16.78 | 11% | Low | 15 Nov 2026, 04:00 |
Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes
Frequently asked questions
- Which provinces does the Pa Sak River flow through?
- The Pa Sak River flows through 5 provinces: Loei, Phetchabun, Lopburi, Saraburi and Phra Nakhon Si Ayutthaya.
- How long is the Pa Sak River?
- The Pa Sak River is about 735 km long, measured along the river on this map. Official figures can differ slightly with the method used.
- Where does the Pa Sak River come from?
- The Pa Sak River rises in Loei province.
- Which river does the Pa Sak River flow into?
- The Pa Sak River flows into the Chao Phraya River in Phra Nakhon Si Ayutthaya province.
- Which dams are on the Pa Sak River?
- Dams on the Pa Sak River on this map: Pasak Jolasid Dam and Rama VI Dam.
- What is the Pa Sak River water level today?
- Of 15 gauging stations, 0 are over the bank and 2 have high water. Data as of 15 Nov 2026, 05:20.
- What is the Pa Sak River called in Thai?
- In Thai the Pa Sak River is แม่น้ำป่าสัก.