USGS Surface Water for USA: Streamflow Measurements

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Streamflow Measurements for the Nation

USGS 01136350 AMMONOOSUC R AB HALFWAY BRK, NR TWIN MOUNTAIN, NH

Coos County, New Hampshire

Hydrologic Unit Code 01080101

Latitude 44°15'43", Longitude 71°24'25" NAD27

Drainage area 14.2 square miles

Gage datum 1,820 feet above NGVD29

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Meas. Number	Date Time	Time Datum	Measurement Used?	Who	Measuring Agency	Stream flow (ft³/s)	Gage Height (ft)	GH Change (ft)	Meas. Duration (hr)	Meas. Rated	Control	Flow Adjust. Code
17	2025-08-25 11:03:01	EDT	Yes	BJC SGS	USGS	6.46	1.69			Fair	Clear	NONE
16	2025-08-25 10:55:57	EDT	Yes	BJC SGS	USGS	6.69	1.69			Fair	Clear	NONE
15	2025-08-12 08:38:03	EDT	Yes	RGK	USGS	8.84	1.74	0.00	0.50	Fair	Clear	NONE
13	2025-06-11 13:10:58	EDT	Yes	AOK/SS	USGS	66.2	2.45			Fair	Clear	NONE
14	2025-06-11 13:01:54	EDT	Yes	AOK/SS	USGS	61.7	2.45			Fair	Clear	NONE
12	2025-04-24 11:42:17	EDT	Yes	MSH	USGS	64.6	2.49	-0.01	0.50	Fair	Clear	NONE
11	2024-11-08 08:47:55	EST	Yes	MSH	USGS	15.8	1.93	0.00	0.75	Poor	Clear	NONE
10	2024-09-09 11:28:50	EDT	Yes	MSH/JDK	USGS	17.8	1.98	0.00	1.00	Poor	Clear	NONE
9	2024-09-09 11:28:43	EDT	Yes	MSH/JDK	USGS	19.4	1.98	0.00	0.00	Poor	Clear	NONE
8	2024-08-15 13:16:01	EDT	Yes	MSH	USGS	37.2	2.20	-0.01	1.00	Fair	Clear	NONE
7	2023-11-02 14:34:07	EDT	Yes	MSH	USGS	45.5	2.25	0.00	0.50	Fair	Clear	NONE
6	2023-10-03 12:34:41	EDT	Yes	SGS	USGS	26.3	1.98			Good	Clear	NONE
5	2023-09-05 14:23:30	EDT	Yes	SGS	USGS	27.6	2.02			Fair	Clear	NONE
4	2023-09-05 14:18:53	EDT	Yes	SGS	USGS	29.0	2.02			Fair	Clear	NONE
3	2023-08-11 09:05:30	EDT	Yes	SGS	USGS	139	2.96	0.04	1.00	Good	Clear	NONE
2	2023-08-02 13:48:05	EDT	Yes	SGS	USGS	28.7	2.03			Good		NONE
1	2023-07-18 12:11:27	EDT	Yes	SGS	USGS	88.3	2.64			Fair	Clear	NONE

Meas.
Number

Date Time

Time
Datum

Measurement
Used?

Who

Measuring
Agency

Stream
flow
(ft³/s)

Gage
Height
(ft)

GH
Change
(ft)

Meas.
Duration
(hr)

Meas.
Rated

Control

Flow
Adjust.
Code

2025-08-25 11:03:01

EDT

Yes

BJC SGS

USGS

6.46

1.69

Fair

Clear

NONE

2025-08-25 10:55:57

EDT

Yes

BJC SGS

USGS

6.69

1.69

Fair

Clear

NONE

2025-08-12 08:38:03

EDT

Yes

RGK

USGS

8.84

1.74

0.00

0.50

Fair

Clear

NONE

2025-06-11 13:10:58

EDT

Yes

AOK/SS

USGS

66.2

2.45

Fair

Clear

NONE

2025-06-11 13:01:54

EDT

Yes

AOK/SS

USGS

61.7

2.45

Fair

Clear

NONE

2025-04-24 11:42:17

EDT

Yes

MSH

USGS

64.6

2.49

-0.01

0.50

Fair

Clear

NONE

2024-11-08 08:47:55

EST

Yes

MSH

USGS

15.8

1.93

0.00

0.75

Poor

Clear

NONE

2024-09-09 11:28:50

EDT

Yes

MSH/JDK

USGS

17.8

1.98

0.00

1.00

Poor

Clear

NONE

2024-09-09 11:28:43

EDT

Yes

MSH/JDK

USGS

19.4

1.98

0.00

Poor

Clear

NONE

2024-08-15 13:16:01

EDT

Yes

MSH

USGS

37.2

2.20

-0.01

1.00

Fair

Clear

NONE

2023-11-02 14:34:07

EDT

Yes

MSH

USGS

45.5

2.25

0.00

0.50

Fair

Clear

NONE

2023-10-03 12:34:41

EDT

Yes

SGS

USGS

26.3

1.98

Good

Clear

NONE

2023-09-05 14:23:30

EDT

Yes

SGS

USGS

27.6

2.02

Fair

Clear

NONE

2023-09-05 14:18:53

EDT

Yes

SGS

USGS

29.0

2.02

Fair

Clear

NONE

2023-08-11 09:05:30

EDT

Yes

SGS

USGS

139

2.96

0.04

1.00

Good

Clear

NONE

2023-08-02 13:48:05

EDT

Yes

SGS

USGS

28.7

2.03

Good

NONE

2023-07-18 12:11:27

EDT

Yes

SGS

USGS

88.3

2.64

Fair

Clear

NONE