Port Louisa National Wildlife Refuge is a national wildlife refuge in Mercer County, Illinois. The nearest town is Wapello, about 12.9 km (8.0 mi) away (Port Louisa National Wildlife Refuge lies E of town).
Port Louisa National Wildlife Refuge is a 10,780-acre (43.6 km2) National Wildlife Refuge located on the Mississippi River at the border of Illinois and Iowa. The refuge is east of Wapello, in Louisa County, Iowa and Mercer County, Illinois. Port Louisa is divided into four divisions: Louisa, Horseshoe Bend, Big Timber (including the islands) and Keithsburg. Port Louisa is the northernmost refuge in the Mark Twain National Wildlife Refuge Complex. The refuge provides several opportunities for public use including hunting, fishing, hiking, photography, interpretation, environmental education, and wildlife observation (not all activities are allowed on all divisions). Port Louisa was established for the protection of migratory birds. It is located along the Mississippi Flyway, one of the major routes for migrating waterfowl. Key goals of the refuge are to conserve and enhance the...From the Wikipedia article “Port Louisa National Wildlife Refuge”, licensed under CC BY-SA 4.0.
Sunrise & sunset directions
At Port Louisa National Wildlife Refuge the sunrise point swings a long way through the year: about 57° (ENE) at the June solstice and 121° (ESE) in late December. Sunset moves from 303° (WNW) in June to 239° (WSW) in December, and the midday sun climbs to 72° in summer but only 25° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:08 AM | 90° E | 7:16 PM | 271° W | 49° | 12h 08m |
| June solstice (Jun 21) | 5:32 AM | 57° ENE | 8:41 PM | 303° WNW | 72° | 15h 09m |
| September equinox (Sep 22) | 6:52 AM | 89° E | 7:03 PM | 271° W | 49° | 12h 11m |
| December solstice (Dec 21) | 7:27 AM | 121° ESE | 4:39 PM | 239° WSW | 25° | 9h 12m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Wildlife is most active in the first and last two hours of daylight — exactly when the light is warmest.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:58 AM | 7:28 AM | 8:11 AM | 4:18 PM | 5:00 PM | 5:31 PM | 9h 32m |
| February | 6:32 AM | 7:00 AM | 7:38 AM | 5:00 PM | 5:39 PM | 6:07 PM | 10h 39m |
| March | 6:49 AM | 7:17 AM | 7:53 AM | 6:35 PM | 7:11 PM | 7:38 PM | 11h 54m |
| April | 5:57 AM | 6:25 AM | 7:02 AM | 7:07 PM | 7:44 PM | 8:13 PM | 13h 19m |
| May | 5:15 AM | 5:47 AM | 6:26 AM | 7:36 PM | 8:16 PM | 8:47 PM | 14h 29m |
| June | 4:58 AM | 5:32 AM | 6:13 AM | 7:58 PM | 8:39 PM | 9:13 PM | 15h 08m |
| July | 5:12 AM | 5:45 AM | 6:26 AM | 7:56 PM | 8:36 PM | 9:09 PM | 14h 52m |
| August | 5:45 AM | 6:14 AM | 6:52 AM | 7:27 PM | 8:05 PM | 8:34 PM | 13h 50m |
| September | 6:18 AM | 6:45 AM | 7:22 AM | 6:39 PM | 7:15 PM | 7:43 PM | 12h 30m |
| October | 6:48 AM | 7:16 AM | 7:54 AM | 5:47 PM | 6:25 PM | 6:53 PM | 11h 09m |
| November | 6:23 AM | 6:53 AM | 7:34 AM | 4:05 PM | 4:46 PM | 5:16 PM | 9h 53m |
| December | 6:52 AM | 7:23 AM | 8:08 AM | 3:53 PM | 4:37 PM | 5:08 PM | 9h 13m |
Local time (America/Chicago), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Port Louisa National Wildlife Refuge, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.5 hours on a moonless night), and the core peaks around 20° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -2° | — |
| February | 5:21 AM – 5:21 AM | 0.0 | 10° | SE → SE |
| March | 4:33 AM – 5:33 AM | 1.0 | 16° | SE → SSE |
| April | 2:33 AM – 4:43 AM | 2.2 | 19° | SE → S |
| May | 12:30 AM – 3:50 AM | 3.3 | 20° | SE → S |
| June | 10:48 PM – 3:18 AM | 4.5 | 20° | SSE → SSW |
| July | 10:38 PM – 1:58 AM | 3.3 | 20° | S → SW |
| August | 9:49 PM – 11:49 PM | 2.0 | 19° | S → SW |
| September | 8:49 PM – 9:49 PM | 1.0 | 16° | SSW → SW |
| October | 7:56 PM – 7:56 PM | 0.0 | 10° | SW → SW |
| November | Below 10° in darkness | — | -1° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.57 mag/arcsec². Aurora needs roughly Kp 6.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show September as the clearest month (about 43% average cloud cover) and December as the cloudiest (68%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 62 | 71 | 78 | 84 | 94 | 101 | 110 | 103 | 104 | 93 | 76 | 71 |
| Low °F | -33 | -15 | -9 | 17 | 28 | 43 | 48 | 45 | 35 | 23 | 6 | -16 |
| Precip. (in) | 1.1 | 1.6 | 2.2 | 3.6 | 4.3 | 5.1 | 3.6 | 3.9 | 3.4 | 2.9 | 1.9 | 1.8 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this national wildlife refuge
- Use auto-loop roads as mobile blinds; animals often tolerate vehicles more than people on foot.
- Stay on designated routes and keep a respectful distance — if an animal changes behavior, you are too close.
- A 400–600 mm lens (or a crop body) is the usual tool for birds.
- Fast shutter speeds (1/2000 s+) freeze wingbeats; raise ISO rather than lose the shot.
- Scout in daylight if you plan to shoot at night or before sunrise.
Season: Spring and autumn migration are the highlights; winter brings waterfowl to many southern refuges.
Suggested gear: Telephoto lens (400 mm+), Bean bag for car window, Binoculars. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
Drones: Launching or landing drones on National Wildlife Refuge lands generally requires a special use permit from the refuge manager, and wildlife disturbance rules apply everywhere.
Nearby photo spots
Other locations within 40 km of Port Louisa National Wildlife Refuge, closest first.
National Wildlife Refuge
State Park
Scenic Viewpoint
State Park
Covered BridgeCampgrounds nearby (Recreation.gov)
FAQ
When is the best time to photograph Port Louisa National Wildlife Refuge?
What time is golden hour at Port Louisa National Wildlife Refuge?
Where does the sun rise and set at Port Louisa National Wildlife Refuge?
Can you see the Milky Way from Port Louisa National Wildlife Refuge?
Do you need a permit to photograph at Port Louisa National Wildlife Refuge?
How far is Port Louisa National Wildlife Refuge from Wapello?
Sources
Location data: Wikidata, Wikipedia. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.