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Hydrograph River at a Glance Download Inundation
Mapping
Swatara Creek near Hershey Stage (ft)Flow (kcfs)Highest Observation: 1.85 ft at 6:30AM Oct 19, 2021Highest Observation: 1.85 ft at 6:45AM Oct 19, 2021Observed: 1.84 ft at 7:00AM Oct 19, 2021Highest Observation: 1.85 ft at 7:15AM Oct 19, 2021Highest Observation: 1.85 ft at 7:30AM Oct 19, 2021Highest Observation: 1.85 ft at 7:45AM Oct 19, 2021Observed: 1.84 ft at 8:00AM Oct 19, 2021Observed: 1.84 ft at 8:15AM Oct 19, 2021Observed: 1.84 ft at 8:30AM Oct 19, 2021Observed: 1.84 ft at 8:45AM Oct 19, 2021Observed: 1.84 ft at 9:00AM Oct 19, 2021Observed: 1.84 ft at 9:15AM Oct 19, 2021Observed: 1.84 ft at 9:30AM Oct 19, 2021Observed: 1.84 ft at 9:45AM Oct 19, 2021Observed: 1.84 ft at 10:00AM Oct 19, 2021Observed: 1.84 ft at 10:15AM Oct 19, 2021Observed: 1.84 ft at 10:30AM Oct 19, 2021Observed: 1.84 ft at 10:45AM Oct 19, 2021Observed: 1.84 ft at 11:00AM Oct 19, 2021Observed: 1.84 ft at 11:15AM Oct 19, 2021Observed: 1.84 ft at 11:30AM Oct 19, 2021Observed: 1.84 ft at 11:45AM Oct 19, 2021Observed: 1.83 ft at 12:00PM Oct 19, 2021Observed: 1.84 ft at 12:15PM Oct 19, 2021Observed: 1.84 ft at 12:30PM Oct 19, 2021Observed: 1.84 ft at 12:45PM Oct 19, 2021Observed: 1.84 ft at 1:00PM Oct 19, 2021Observed: 1.84 ft at 1:15PM Oct 19, 2021Observed: 1.84 ft at 1:30PM Oct 19, 2021Observed: 1.84 ft at 1:45PM Oct 19, 2021Observed: 1.83 ft at 2:00PM Oct 19, 2021Observed: 1.84 ft at 2:15PM Oct 19, 2021Observed: 1.84 ft at 2:30PM Oct 19, 2021Observed: 1.84 ft at 2:45PM Oct 19, 2021Observed: 1.84 ft at 3:00PM Oct 19, 2021Observed: 1.84 ft at 3:15PM Oct 19, 2021Observed: 1.84 ft at 3:30PM Oct 19, 2021Observed: 1.84 ft at 3:32PM Oct 19, 2021Observed: 1.84 ft at 3:45PM Oct 19, 2021Observed: 1.84 ft at 4:00PM Oct 19, 2021Observed: 1.84 ft at 4:15PM Oct 19, 2021Observed: 1.84 ft at 4:30PM Oct 19, 2021Observed: 1.84 ft at 4:45PM Oct 19, 2021Observed: 1.84 ft at 5:00PM Oct 19, 2021Highest Observation: 1.85 ft at 5:15PM Oct 19, 2021Observed: 1.84 ft at 5:30PM Oct 19, 2021Highest Observation: 1.85 ft at 5:45PM Oct 19, 2021Highest Observation: 1.85 ft at 6:00PM Oct 19, 2021Highest Observation: 1.85 ft at 6:15PM Oct 19, 2021Highest Observation: 1.85 ft at 6:30PM Oct 19, 2021Highest Observation: 1.85 ft at 6:45PM Oct 19, 2021Highest Observation: 1.85 ft at 7:00PM Oct 19, 2021Highest Observation: 1.85 ft at 7:15PM Oct 19, 2021Highest Observation: 1.85 ft at 7:30PM Oct 19, 2021Highest Observation: 1.85 ft at 7:45PM Oct 19, 2021Highest Observation: 1.85 ft at 8:00PM Oct 19, 2021Highest Observation: 1.85 ft at 8:15PM Oct 19, 2021Highest Observation: 1.85 ft at 8:30PM Oct 19, 2021Observed: 1.84 ft at 8:45PM Oct 19, 2021Highest Observation: 1.85 ft at 9:00PM Oct 19, 2021Observed: 1.84 ft at 9:15PM Oct 19, 2021Observed: 1.84 ft at 9:30PM Oct 19, 2021Highest Observation: 1.85 ft at 9:45PM Oct 19, 2021Observed: 1.84 ft at 10:00PM Oct 19, 2021Observed: 1.84 ft at 10:15PM Oct 19, 2021Observed: 1.84 ft at 10:30PM Oct 19, 2021Observed: 1.84 ft at 10:45PM Oct 19, 2021Observed: 1.84 ft at 11:00PM Oct 19, 2021Observed: 1.84 ft at 11:15PM Oct 19, 2021Observed: 1.84 ft at 11:30PM Oct 19, 2021Observed: 1.84 ft at 11:45PM Oct 19, 2021Observed: 1.84 ft at 12:00AM Oct 20, 2021Observed: 1.84 ft at 12:15AM Oct 20, 2021Observed: 1.84 ft at 12:30AM Oct 20, 2021Observed: 1.84 ft at 12:45AM Oct 20, 2021Observed: 1.84 ft at 1:00AM Oct 20, 2021Observed: 1.84 ft at 1:15AM Oct 20, 2021Observed: 1.84 ft at 1:30AM Oct 20, 2021Observed: 1.84 ft at 1:45AM Oct 20, 2021Observed: 1.84 ft at 2:00AM Oct 20, 2021Observed: 1.84 ft at 2:15AM Oct 20, 2021Observed: 1.84 ft at 2:30AM Oct 20, 2021Observed: 1.84 ft at 2:45AM Oct 20, 2021Observed: 1.84 ft at 3:00AM Oct 20, 2021Observed: 1.84 ft at 3:15AM Oct 20, 2021Observed: 1.84 ft at 3:30AM Oct 20, 2021Observed: 1.84 ft at 3:45AM Oct 20, 2021Observed: 1.84 ft at 4:00AM Oct 20, 2021Observed: 1.84 ft at 4:15AM Oct 20, 2021Observed: 1.84 ft at 4:30AM Oct 20, 2021Observed: 1.84 ft at 4:45AM Oct 20, 2021Observed: 1.84 ft at 5:00AM Oct 20, 2021Observed: 1.84 ft at 5:15AM Oct 20, 2021Observed: 1.84 ft at 5:30AM Oct 20, 2021Observed: 1.84 ft at 5:45AM Oct 20, 2021Observed: 1.83 ft at 6:00AM Oct 20, 2021Observed: 1.84 ft at 6:15AM Oct 20, 2021Observed: 1.83 ft at 6:30AM Oct 20, 2021Observed: 1.83 ft at 6:45AM Oct 20, 2021Observed: 1.83 ft at 7:00AM Oct 20, 2021Observed: 1.84 ft at 7:15AM Oct 20, 2021Observed: 1.84 ft at 7:30AM Oct 20, 2021Observed: 1.83 ft at 7:45AM Oct 20, 2021Observed: 1.83 ft at 8:00AM Oct 20, 2021Observed: 1.83 ft at 8:15AM Oct 20, 2021Observed: 1.83 ft at 8:30AM Oct 20, 2021Observed: 1.83 ft at 8:45AM Oct 20, 2021Observed: 1.83 ft at 9:00AM Oct 20, 2021Observed: 1.83 ft at 9:15AM Oct 20, 2021Observed: 1.83 ft at 9:30AM Oct 20, 2021Observed: 1.83 ft at 9:45AM Oct 20, 2021Observed: 1.83 ft at 10:00AM Oct 20, 2021Observed: 1.83 ft at 10:15AM Oct 20, 2021Observed: 1.83 ft at 10:30AM Oct 20, 2021Observed: 1.83 ft at 10:45AM Oct 20, 2021Observed: 1.83 ft at 11:00AM Oct 20, 2021Observed: 1.83 ft at 11:15AM Oct 20, 2021Observed: 1.83 ft at 11:30AM Oct 20, 2021Observed: 1.83 ft at 11:45AM Oct 20, 2021Observed: 1.83 ft at 12:00PM Oct 20, 2021Observed: 1.83 ft at 12:15PM Oct 20, 2021Observed: 1.83 ft at 12:30PM Oct 20, 2021Observed: 1.83 ft at 12:45PM Oct 20, 2021Observed: 1.83 ft at 1:00PM Oct 20, 2021Observed: 1.83 ft at 1:15PM Oct 20, 2021Observed: 1.84 ft at 1:30PM Oct 20, 2021Observed: 1.83 ft at 1:45PM Oct 20, 2021Observed: 1.83 ft at 2:00PM Oct 20, 2021Observed: 1.83 ft at 2:15PM Oct 20, 2021Observed: 1.83 ft at 2:30PM Oct 20, 2021Observed: 1.83 ft at 2:45PM Oct 20, 2021Observed: 1.83 ft at 3:00PM Oct 20, 2021Observed: 1.83 ft at 3:15PM Oct 20, 2021Observed: 1.83 ft at 3:30PM Oct 20, 2021Observed: 1.83 ft at 3:31PM Oct 20, 2021Observed: 1.83 ft at 3:45PM Oct 20, 2021Observed: 1.82 ft at 4:00PM Oct 20, 2021Observed: 1.82 ft at 4:15PM Oct 20, 2021Observed: 1.82 ft at 4:30PM Oct 20, 2021Observed: 1.82 ft at 4:45PM Oct 20, 2021Observed: 1.82 ft at 5:00PM Oct 20, 2021Observed: 1.81 ft at 5:15PM Oct 20, 2021Observed: 1.81 ft at 5:30PM Oct 20, 2021Observed: 1.81 ft at 5:45PM Oct 20, 2021Observed: 1.81 ft at 6:00PM Oct 20, 2021Observed: 1.81 ft at 6:15PM Oct 20, 2021Observed: 1.81 ft at 6:30PM Oct 20, 2021Observed: 1.81 ft at 6:45PM Oct 20, 2021Observed: 1.81 ft at 7:00PM Oct 20, 2021Observed: 1.81 ft at 7:15PM Oct 20, 2021Observed: 1.81 ft at 7:30PM Oct 20, 2021Observed: 1.81 ft at 7:45PM Oct 20, 2021Observed: 1.81 ft at 8:00PM Oct 20, 2021Observed: 1.81 ft at 8:15PM Oct 20, 2021Observed: 1.81 ft at 8:30PM Oct 20, 2021Observed: 1.82 ft at 8:45PM Oct 20, 2021Observed: 1.82 ft at 9:00PM Oct 20, 2021Observed: 1.82 ft at 9:15PM Oct 20, 2021Observed: 1.82 ft at 9:30PM Oct 20, 2021Observed: 1.82 ft at 9:45PM Oct 20, 2021Observed: 1.82 ft at 10:00PM Oct 20, 2021Observed: 1.82 ft at 10:15PM Oct 20, 2021Observed: 1.82 ft at 10:30PM Oct 20, 2021Observed: 1.82 ft at 10:45PM Oct 20, 2021Observed: 1.82 ft at 11:00PM Oct 20, 2021Observed: 1.82 ft at 11:15PM Oct 20, 2021Observed: 1.82 ft at 11:30PM Oct 20, 2021Observed: 1.82 ft at 11:45PM Oct 20, 2021Observed: 1.82 ft at 12:00AM Oct 21, 2021Observed: 1.82 ft at 12:15AM Oct 21, 2021Observed: 1.82 ft at 12:30AM Oct 21, 2021Observed: 1.82 ft at 12:45AM Oct 21, 2021Observed: 1.82 ft at 1:00AM Oct 21, 2021Observed: 1.82 ft at 1:15AM Oct 21, 2021Observed: 1.82 ft at 1:30AM Oct 21, 2021Observed: 1.82 ft at 1:45AM Oct 21, 2021Observed: 1.82 ft at 2:00AM Oct 21, 2021Observed: 1.82 ft at 2:15AM Oct 21, 2021Observed: 1.82 ft at 2:30AM Oct 21, 2021Observed: 1.82 ft at 2:45AM Oct 21, 2021Observed: 1.82 ft at 3:00AM Oct 21, 2021Observed: 1.82 ft at 3:15AM Oct 21, 2021Observed: 1.82 ft at 3:30AM Oct 21, 2021Observed: 1.82 ft at 3:45AM Oct 21, 2021Observed: 1.82 ft at 4:00AM Oct 21, 2021Observed: 1.82 ft at 4:15AM Oct 21, 2021Observed: 1.82 ft at 4:30AM Oct 21, 2021Observed: 1.82 ft at 4:45AM Oct 21, 2021Observed: 1.82 ft at 5:00AM Oct 21, 2021Observed: 1.82 ft at 5:15AM Oct 21, 2021Observed: 1.82 ft at 5:30AM Oct 21, 2021Observed: 1.82 ft at 5:45AM Oct 21, 2021Observed: 1.82 ft at 6:00AM Oct 21, 2021Observed: 1.82 ft at 6:15AM Oct 21, 2021Observed: 1.82 ft at 6:30AM Oct 21, 2021Observed: 1.82 ft at 6:45AM Oct 21, 2021Observed: 1.81 ft at 7:00AM Oct 21, 2021Observed: 1.81 ft at 7:15AM Oct 21, 2021Observed: 1.81 ft at 7:30AM Oct 21, 2021Observed: 1.81 ft at 7:45AM Oct 21, 2021Observed: 1.81 ft at 8:00AM Oct 21, 2021Observed: 1.81 ft at 8:15AM Oct 21, 2021Observed: 1.81 ft at 8:30AM Oct 21, 2021Observed: 1.81 ft at 8:45AM Oct 21, 2021Observed: 1.81 ft at 9:00AM Oct 21, 2021Observed: 1.81 ft at 9:15AM Oct 21, 2021Observed: 1.81 ft at 9:30AM Oct 21, 2021Observed: 1.81 ft at 9:45AM Oct 21, 2021Observed: 1.81 ft at 10:00AM Oct 21, 2021Observed: 1.81 ft at 10:15AM Oct 21, 2021Observed: 1.81 ft at 10:30AM Oct 21, 2021Observed: 1.81 ft at 10:45AM Oct 21, 2021Observed: 1.81 ft at 11:00AM Oct 21, 2021Observed: 1.81 ft at 11:15AM Oct 21, 2021Observed: 1.81 ft at 11:30AM Oct 21, 2021Observed: 1.81 ft at 11:45AM Oct 21, 2021Observed: 1.81 ft at 12:00PM Oct 21, 2021Observed: 1.81 ft at 12:15PM Oct 21, 2021Observed: 1.81 ft at 12:30PM Oct 21, 2021Observed: 1.81 ft at 12:45PM Oct 21, 2021Observed: 1.81 ft at 1:00PM Oct 21, 2021Observed: 1.81 ft at 1:15PM Oct 21, 2021Observed: 1.81 ft at 1:30PM Oct 21, 2021Observed: 1.81 ft at 1:45PM Oct 21, 2021Observed: 1.81 ft at 2:00PM Oct 21, 2021Observed: 1.81 ft at 2:15PM Oct 21, 2021Observed: 1.81 ft at 2:30PM Oct 21, 2021Observed: 1.81 ft at 2:45PM Oct 21, 2021Observed: 1.81 ft at 3:00PM Oct 21, 2021Observed: 1.81 ft at 3:15PM Oct 21, 2021Observed: 1.81 ft at 3:30PM Oct 21, 2021Observed: 1.81 ft at 3:31PM Oct 21, 2021Observed: 1.81 ft at 3:45PM Oct 21, 2021Observed: 1.81 ft at 4:00PM Oct 21, 2021Observed: 1.81 ft at 4:15PM Oct 21, 2021Observed: 1.81 ft at 4:30PM Oct 21, 2021Observed: 1.81 ft at 4:45PM Oct 21, 2021Observed: 1.81 ft at 5:00PM Oct 21, 2021Observed: 1.81 ft at 5:15PM Oct 21, 2021Observed: 1.81 ft at 5:30PM Oct 21, 2021Observed: 1.81 ft at 5:45PM Oct 21, 2021Observed: 1.81 ft at 6:00PM Oct 21, 2021Observed: 1.81 ft at 6:15PM Oct 21, 2021Observed: 1.81 ft at 6:30PM Oct 21, 2021Observed: 1.8 ft at 6:45PM Oct 21, 2021Observed: 1.8 ft at 7:00PM Oct 21, 2021Observed: 1.8 ft at 7:15PM Oct 21, 2021Observed: 1.8 ft at 7:30PM Oct 21, 2021Observed: 1.8 ft at 7:45PM Oct 21, 2021Observed: 1.8 ft at 8:00PM Oct 21, 2021Observed: 1.8 ft at 8:15PM Oct 21, 2021Observed: 1.79 ft at 8:30PM Oct 21, 2021Observed: 1.79 ft at 8:45PM Oct 21, 2021Observed: 1.79 ft at 9:00PM Oct 21, 2021Observed: 1.79 ft at 9:15PM Oct 21, 2021Observed: 1.79 ft at 9:30PM Oct 21, 2021Observed: 1.79 ft at 9:45PM Oct 21, 2021Observed: 1.78 ft at 10:00PM Oct 21, 2021Observed: 1.79 ft at 10:15PM Oct 21, 2021Observed: 1.79 ft at 10:30PM Oct 21, 2021Observed: 1.78 ft at 10:45PM Oct 21, 2021Observed: 1.79 ft at 11:00PM Oct 21, 2021Observed: 1.78 ft at 11:15PM Oct 21, 2021Observed: 1.78 ft at 11:30PM Oct 21, 2021Observed: 1.78 ft at 11:45PM Oct 21, 2021Observed: 1.79 ft at 12:00AM Oct 22, 2021Observed: 1.78 ft at 12:15AM Oct 22, 2021Observed: 1.78 ft at 12:30AM Oct 22, 2021Observed: 1.78 ft at 12:45AM Oct 22, 2021Observed: 1.79 ft at 1:00AM Oct 22, 2021Observed: 1.79 ft at 1:15AM Oct 22, 2021Observed: 1.79 ft at 1:30AM Oct 22, 2021Observed: 1.79 ft at 1:45AM Oct 22, 2021Observed: 1.79 ft at 2:00AM Oct 22, 2021Observed: 1.79 ft at 2:15AM Oct 22, 2021Observed: 1.79 ft at 2:30AM Oct 22, 2021Observed: 1.79 ft at 2:45AM Oct 22, 2021Observed: 1.79 ft at 3:00AM Oct 22, 2021Observed: 1.79 ft at 3:15AM Oct 22, 2021Observed: 1.79 ft at 3:30AM Oct 22, 2021Observed: 1.79 ft at 3:45AM Oct 22, 2021Observed: 1.79 ft at 4:00AM Oct 22, 2021Observed: 1.79 ft at 4:15AM Oct 22, 2021Observed: 1.79 ft at 4:30AM Oct 22, 2021Observed: 1.79 ft at 4:45AM Oct 22, 2021Observed: 1.79 ft at 5:00AM Oct 22, 2021Observed: 1.79 ft at 5:15AM Oct 22, 2021Observed: 1.79 ft at 5:30AM Oct 22, 2021Observed: 1.79 ft at 5:45AM Oct 22, 2021Highest Forecast: 1.8 ft 8:00AM Oct 22, 2021Highest Forecast: 1.8 ft 2:00PM Oct 22, 2021Highest Forecast: 1.8 ft 8:00PM Oct 22, 2021Highest Forecast: 1.8 ft 2:00AM Oct 23, 2021Highest Forecast: 1.8 ft 8:00AM Oct 23, 2021Highest Forecast: 1.8 ft 2:00PM Oct 23, 2021Highest Forecast: 1.8 ft 8:00PM Oct 23, 2021Highest Forecast: 1.8 ft 2:00AM Oct 24, 2021Highest Forecast: 1.8 ft 8:00AM Oct 24, 2021Highest Forecast: 1.8 ft 2:00PM Oct 24, 2021Highest Forecast: 1.8 ft 8:00PM Oct 24, 2021USGS--Water Resources of the United StatesHERP1(plotting HGIRG) Graph Created (6:17AM Oct 22, 2021)ObservedForecast (issued 9:50PM Oct 21)Latest observed value: 1.79 ft at 5:45 AM EDT 22-Oct-2021. Flood Stage is 7 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts for the Swatara Creek near Hershey are issued routinely year-round.
Return to Area Map
Upstream Gauge - at Harper Tavern Upstream Gauge Downstream Gauge Downstream Gauge - at Middletown
Flood Categories (in feet)
Major Flood Stage: 14
Moderate Flood Stage: 10
Flood Stage: 7
Action Stage: 6
Low Stage (in feet): 0

Historic Crests
(1) 26.80 ft on 09/08/2011
(2) 17.08 ft on 07/26/2018
(3) 16.12 ft on 06/29/2006
(4) 15.36 ft on 09/27/1975
(5) 14.43 ft on 01/25/1979
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 14.01 ft on 09/03/2021 (P)
(2) 8.94 ft on 12/26/2020 (P)
(3) 7.24 ft on 05/01/2020 (P)
(4) 8.52 ft on 11/02/2019 (P)
(5) 7.14 ft on 04/16/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.20 ft on 07/14/1983
(2) 1.40 ft on 09/15/1980
(3) 1.40 ft on 08/15/1987
(4) 1.44 ft on 09/12/1977
(5) 1.44 ft on 07/17/1988

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 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 Collapse
If you notice any errors in the below information, please contact our Webmaster
27 FEMA 0.2% Annual Chance Flood Level (500-year flood).
26.8 Flood of record from the flooding in September, 2011. Maximum recordable gage height (stage sensor operational limit). Water levels above this stage will not be reported in real time.
20 FEMA 1% Annual Chance Flood Level (100-year flood).
18 Flood waters begin to reach the Route 39 Bridge (Hershey Road) northwest of Hershey. FEMA 2% Annual Chance Flood Level (50-year flood).
16 Numerous homes adjacent to the creek are affected by high water.
14 Numerous homes adjacent to the creek are affected by high water.
12 High water affects several homes upstream of the Route 39 bridge. FEMA 10% Annual Chance Flood Level (10-year flood).
10 A few homes adjacent to the creek upstream of the Route 39 bridge flood.
8 The right, or north bank overflows. Several roads are affected.
7 The right, or north bank begins to overflow. Several roadways upstream of the gage are affected by high water.
Photos
(1) looking upstream
(2) view of the gagehouse
(3) looking downstream
About This Location Collapse

Latitude: 40.298333° N, Longitude: 76.668056° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 7 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 325.94 332.94 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
Additional Information Collapse
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)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

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.
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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
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