USGS · 01470870

BLUE MARSH DAM RIVER

USGS · 01470870LIVE

Blue Marsh Dam

LOWER HEIDELBERG TOWNSHIP, PA40.3793°N, -76.0327°W

AIR TEMP

82°F

WIND

7mph W

FISH INDEX

50SCORE / 100

GOOD · 3 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 DAY

—cfs

No flow data available

Precipitation History

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Weather Conditions

WEATHER CONDITIONS

TODAY

83°

58°

THU

86°

60°

FRI

81°

66°

SAT

66°

64°

SUN

81°

62°

MON

83°

62°

TUE

81°

61°

TIME

WED

NOW

THU

FRI

SAT

SUN

MON

TEMP

hourly forecast

69°

mild

69°

68°

67°

65°

64°

62°

61°

60°

63°

69°

73°

78°

82°

84°

85°

86°

84°

85°

84°

82°

79°

76°

74°

67°

66°

67°

66°

67°

70°

74°

78°

80°

81°

78°

77°

78°

77°

74°

72°

71°

70°

68°

66°

65°

64°

65°

66°

65°

64°

62°

65°

67°

71°

74°

77°

79°

80°

81°

78°

77°

76°

72°

69°

67°

66°

65°

64°

63°

62°

64°

67°

69°

71°

74°

76°

79°

81°

82°

83°

82°

WIND

mph · gust · dir

2mph WNW

WNW

ENE

NNW

NNE

G11

ESE

G11

SSE

G13

SSW

G15

G16

G18

G19

G20

G24

G18

SSE

G15

G24

SSE

G28

WSW

G10

ENE

G12

ESE

ENE

G10

G11

SSE

ESE

G10

G12

G13

WSW

G10

G11

WNW

G11

WNW

WSW

G13

G17

SSW

ENE

WNW

NNE

NNW

NNE

NNW

WSW

NNW

NNE

ENE

ESE

SSE

SSW

WNW

NNE

ENE

PRECIP

chance %

10%

17%

18%

23%

38%

24%

23%

30%

35%

54%

77%

70%

43%

13%

CLOUDS

cover %

clear

100%

89%

100%

78%

100%

77%

72%

100%

71%

100%

92%

98%

100%

93%

100%

26%

100%

94%

95%

53%

100%

20%

56%

95%

99%

91%

86%

90%

96%

83%

65%

52%

PRESSURE

hPa · trend

1006

TemperatureWind / GustsPrecipitationCloud coverPressure

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FISH INDEX

Temperature

Too Hot

Wind

Light

Pressure

Rising — Slow

Moon Phase

Average

DAYLIGHT

SUNRISE

05:35 AM

SUNSET

08:38 PM

15H 3M OF DAYLIGHT0H 0M REMAINING

MOON PHASE

Waxing Gibbous

74% illuminated

Station Location

40.3793, -76.0327

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DATA · USGS · NOAA · NWSUPDATED 2026-06-24 22:59 UTC

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