National Weather Service Advanced Hydrologic Prediction Service

weather.gov

Home

News

Organization

Search by city or zip code. Press enter or select the go button to submit request

National Conditions
    Rivers
    Satellite
    Climate
    Observed Precip

Local Conditions
    Warnings
    Weather Forecast
    Radar

AHPS Documentation
User Guide
User Brochure

What is AHPS?
Facts
Our Partners

Feedback/Questions
Provide Feedback
Ask Questions

This probabilistic forecast is issued by the Middle Atlantic River Forecast Center.

	Hydrograph			River at a Glance			Download			Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

About this graph

Forecasts for the Conestoga River at Lancaster are issued routinely year-round.

Return to Area Map

Zoom Level:16

Flood Categories (in feet)

Major Flood Stage:	15
Moderate Flood Stage:	13
Flood Stage:	11
Action Stage:	9
Low Stage (in feet):	0

Historic Crests
(1) 27.90 ft on 06/23/1972
(2) 21.30 ft on 09/08/2011
(3) 18.49 ft on 09/02/2021
(4) 18.14 ft on 01/25/1978
(5) 17.80 ft on 10/09/2005
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.49 ft on 09/02/2021
(2) 13.86 ft on 08/22/2018
(3) 13.86 ft on 08/22/2018
(4) 14.28 ft on 08/04/2018
(5) 11.63 ft on 05/01/2014
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.30 ft on 11/01/1966
(2) 2.39 ft on 09/30/1965
(3) 2.41 ft on 10/17/1985
(4) 2.42 ft on 09/06/1966
(5) 2.43 ft on 06/14/1976
Show More Low Water Records

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
34.6	Approximate level of the FEMA 0.2% Annual Chance Flood level (500-year flood).
27.9	Flood of record from Hurricane Agnes in 1972.
27	Flood waters begin to reach the South Duke Street Bridge.
26.1	Approximate level of the FEMA 1% Annual Chance Flood level (100-year flood).
22.6	Flood waters begin to reach the New Holland Pike Bridge, and the Eden Road Bridge. Approximate level of the FEMA 2% Annual Chance Flood level (50-year flood).
20	Flood waters begin to reach the East King Street Bridge, the East Strawberry Street Bridge and the bridge at the water treatment facility.
17	Flood waters begin to reach the Hunsecker's Mill Covered Bridge.
15.6	Approximate level of the FEMA 10% Annual Chance Flood level (10-year flood).
15	Many homes near the river are affected by high water.
14	The footbridge near the confluence of Stauffer Run begins to flood.
13	Several homes are affected by high water.
11	Grofftown Road will flood.
Photos (1) looking upstream from gage (2) looking downstream from gage

Other Real-time and/or Archive Data Sources:

U.S. Geological Survey (USGS) Data and Site Info for Lancaster

Additional Information

Potential River Levels - Used to

Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS)	7 Day (NAEFS)	7 Day (GEFS)

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

National Weather Service
State College Weather Forecast Office
328 Innovation Boulevard, Suite 330
State College, PA 16803
(814) 231-2408
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:30 PM

Disclaimer
Credits
Glossary